The Water In Fuel Problem
  The D-TX® Fuel Safe Solution
  The D-TX® Fuel Safe Applications
  FAQs
     
  Frequently Asked Questions  
   
 

The Water in Fuel Problem:

1. What can happen if I get water in my fuel?
2. How do I know I have water in my fuel?
3. How can/did I get water in my fuel?
4. Does the D-TX® Fuel Safe stop the fuel bug?

The D-TX® Fuel Safe Solution

5. Why should I fit the D-TX® Fuel Safe on my craft?
6. I have Racor filters fitted. Do I still need the D-TX® Fuel Safe?
7. I have water traps. Do I need a D-TX® Fuel Safe?
8. I have never had any problems with water in fuel, why would I need a D-TX® Fuel Safe
9. I have twin engines. Do I need two units?
10. On my boat I have a centrifugal polishing system. Why do I need a D-TX® Fuel Safe?
11. I have managed for ten years of boating without one. Why should I buy one now?
12. My yacht has sails and I can always use the wind instead of my engine?

Installation

13. Can I install the D-TX® Fuel Safe myself?
14. Where should I install the D-TX® Fuel Safe?
15. How long does it take to install the D-TX® Fuel Safe?
16. Does the boat need to come out of the water?
17. What size unit do I need for my engine?
18. How long will this unit last?

How It Works

19. Does the D-TX® Fuel Safe restrict the fuel flow
20. How much water will it detect?
21. Do I need filters?
22. What maintenance does the D-TX® Fuel Safe require?
23. What do I do when the alarm goes off?
24. I have a D-TX® Fuel Safe fitted and it has never gone off. How do I know there is no water in my fuel line?
25. Will the D-TX® Fuel Safe alert me to water in my generator’s fuel supply?

Purchasing the D-TX® Fuel Safe

26. Where can I buy the D-TX® Fuel Safe
27. What do I get when I purchase the D-TX® Fuel Safe?
28. What is the cost of maintenance and parts after installation
29. How much does the D-TX product range cost?

 

Answers

The Water in Fuel Problem:
1. What can happen if I get water in my fuel?
From mild to extreme cases the presence of water could cause some or all of the following: filter saturation, engine stoppage, damage to distribution pumps, injectors, con rods, cranks, heads, and engine block. Generators are also vulnerable to water, and consequently any systems they supply, e.g. water purifiers and battery systems. Water in fuel will allow the growth of microorganisms (the diesel bug) that in turn would clog your filters, restrict fuel flow and affect your engine and components as above. Any of these problems can result in inconvenience, expense and down time and at the extreme, risk to life and property.
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2. How do I know I have water in my fuel?
Your engine will misfire, perform badly, and if unnoticed/ignored will stop completely. Any damage could be slight or catastrophic. If you are manually monitoring your fitted filters you may notice water in your filter bowl.
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3. How can/did I get water in my fuel?

  • Poor fuel supply (petrol and diesel). This is becoming an increasing problem as with market pressure for cheaper fuels, there are less safeguards against water contamination.
  • Condensation occurs by the actions of fluctuating temperatures and environmental conditions in air space between the fuel and the top of the tank. If you keep your tank half full of fuel you are more likely to get water due to condensation than if you keep your tank full - it is false economy to keep your tank empty during the winter period.
  • Separation. All fuels contain water, and due to chemical environments and lengths of storage time separation may occur.
  • Leaky deck fittings. Poorly installed or maintained points and seals allow rain or salt water to enter the main tanks. Sailing yachts with engines are more susceptible to the ingress of water because they often cruise with their fuel taps and tank breathers on the waterline, which in rough weather can take water on board.
  • Human error: filling your fuel filler with water.
  • Emulsified fuel (this is the combination of water being mixed with fuel), commonly caused by rolling, yawing, or other erratic movement of the vessel. This can stop an engine stone dead because of the way the water enters the hot combustion chamber, turning to steam, and causing hydraulic lock, in some cases resulting in serious damage to the engine.
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4. Does the D-TX® Fuel Safe stop the fuel bug?
Identifying and eliminating water in your fuel will reduce the opportunity for the diesel bug to develop, which needs the presence of water to grow successfully.
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The D-TX® Fuel Safe Safe Solution

5. Why should I fit theD-TX® Fuel Safe on my craft?
To provide real-time, filter-less monitoring and warning of water in fuel from the moment you start your engine. Thus allowing you to resolve the problem before resulting engine stoppage or engine and component damage or the development of life endangering situations. Some filters have an alarm system fitted. However, although they tend to identify residual amounts of water, in the case of major water influx from various causes the filters can become saturated resulting in the water passing directly over the top and directly into engine systems, thus rendering your filter alarm/s redundant. Few filters offer instantaneous dedicated dash warning diagnosis. The D-TX® Fuel Safe provides additional dash-warning plates for fly bridges, engine rooms, etc.
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6. I have Racor filters fitted. Do I still need the D-TX® Fuel Safe?
The best time to know you have water in your fuel is as early as possible. The D-TX® Fuel Safe monitors the fuel immediately after the fuel exits the fuel tank/s giving the earliest possible warning. We recommend filter systems, however their maintenance requirements would not be best realised or addressed if the helmsman is for example crossing the busiest shipping lanes in the world, such as the English Channel. Once water enters the filter systems, the filters saturate and need replacing. Because the filtering systems are often not immediately visible the situation can go unnoticed, resulting in particles and water flowing on through to the engine, causing damage along the way to pumps, injectors, and the engine itself – very costly!

Statistics show few boat owners are sufficiently vigilant with their filter systems. The D-TX® Fuel Safe dash warning plate offers real-time, filter-less monitoring and warning.
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7. I have water traps. Do I need a D-TX® Fuel Safe?
Yes, high volume fuel flows common in most modern engines could render water traps and sensors ineffective. One charter company with eleven 65’-85’ cruiser yachts fell prey to this. The resulting engine repair costs alone were £6,000. Add to that the loss of two weeks charter in high season and the real cost is even more substantive.
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8. I have never had any problems with water in fuel, why would I need a D-TX® Fuel Safe?
Fuel quality is becoming increasingly unreliable; the inherent nature of fuel and marine conditions and the prolific number of breakdowns due to water in fuel is reason enough to give yourself peace of mind at a very cost effective one-off price. Reliance on water separators and fuel conditioners alone is inadequate. For example, engines with raw watercooling systems have fuel exposed to contamination later in the fuel train. Sailing yachts invariably need to use their engines in rough or emergency conditions - not a good time to realise you have contaminated fuel. Statistically these type of vessels are more prone to engine failure due to water in fuel, compounded by the irregular utilization of motive power and lengthy periods between refueling.
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9. I have twin engines. Do I need two units? We recommend one unit per engine.
All combustion engines are vulnerable to water in fuel. Each engine should be monitored by a D-TX® Fuel Safe unit.
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10. On my boat I have a centrifugal polishing system. Why do I need a D-TX® Fuel Safe?
In the case of one super yacht we recently supplied to, the fuel had passed through its polishing system into day holding tanks, through the filters and into the engine. The excess fuel cooled the fuel components then circulated round a seawater cooling system and back to the day holding tanks. If the seawater cooler ever breached for any reason it would fill the day holding tanks with salt water that would travel back into the engines. This was the fuel passage the engineers needed to monitor to avoid serious damage or destruction to engines worth hundreds of thousands of pounds, not to mention downtime and significant inconvenience.
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11. I have managed for ten years of boating without one. Why should I buy one now?
Since the earliest use of engines people have ‘managed’ with what’s available, now they can be made aware there is a problem and resolve it before it even needs a filter change. Filters are then left to do what they were designed to do – stop debris and micro-particles. Although engines come with their own filter systems, in practice they only offer a degree of protection; detection and protection is at its most effective when carried out as close to the fuel tank as possible.
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12. My yacht has sails and I can always use the wind instead of my engine.
Yacht owners can appreciate the unpredictable nature of the weather and the importance of engine back up as well as systems supplied with liquid fuel that may also be susceptible to water contamination e.g. generators, heaters, cookers. Yachting situations are likely to aggravate water in fuel conditions due to extreme angles of sailing; the D-TX® Fuel Safe will also detect emulsified fuel.
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Installation

13. Can I install the D-TX® Fuel Safe myself?
Simple, easy to follow installation instructions, written by a user for the user, are provided. An average mechanically minded person with a basic tool kit can install this product. Alternatively, so can any reputable marine engineer. The fuel line needs to be cut and the unit inserted as near to the fuel tank as possible. It must be fixed to a bulkhead, stringer or bracket. The dash plate can be mounted where require: On or near the dash or helm position, engine room, engineer’s station or fly-bridge etc and then wired up to the D-TX® Fuel Safe unit.
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14. Where should I install the D-TX® Fuel Safe?
Fitment is recommended as close to the fuel supply as possible. Mount to a bulkhead, strut or stay with the fuel flow in either direction of the unit. In more complicated systems the installation remains the same; we are happy to advise on any individual requirements.
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15. How long does it take to install the D-TX® Fuel Safe?
With average skills, allow a day. A qualified marine engineer should achieve this in less time.
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16. Does the boat need to come out of the water?
No, this is not necessary for fitment. During installation only the fuel line needs to be cut and the unit inserted as near to the fuel tank as possible
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17. What size unit do I need for my engine?
All size engines are catered for from outboards to super yachts. Unit size depends on your fuel supply lines. If you are unsure what size your vessels feed is, measure it or contact us. The standard unit is for fuel supplies up to 10mm, (3/8’’) fuel feed. The unit measures L=160mm x W=50mm x D100mm. For smaller or larger sizes see our product range or contact us for bespoke units.
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18. How long will this unit last?
Designed and built to a very high standard it will last the lifetime of the vessel. Maintenance is limited to regular draining to remove any debris. No spare or replacement parts are required as the unit is a filter-less fuel monitoring and warning system.
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How It Works

19. Does the D-TX® Fuel Safe restrict the fuel flow?
The fuel flow remains constant and unrestricted.
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20. How much water will it detect?
Traditionally sensors are calibrated in parts per million in detection but this means very little to most people. To try to get a better and clearer understanding, a 1.5mm droplet of water will trigger the D-TX® Fuel Safe alarm. The quantities that are detected by theD-TX® Fuel Safe are calculated to give the optimal detection of the minutest amount present in order to prevent any parts or engine damage.
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21. Do I need filters?
Filters are recommended for debris removal; standard engine fuel filters should sift this from the fuel. The ingress of water will mean the maintenance filter may need replacing. The D-TX® Fuel Safe is a filter-less water in fuel monitoring and warning system. It requires no maintenance parts. Detection and warning at this early point in the fuel line allows water contamination to be resolved before the filters have been contaminated. Statistics show most sea going vessels carry on average one spare filter, which may not be enough for even a single episode of water contamination.
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22. What maintenance does the D-TX® Fuel Safe require?
Once a year the unit will require draining to clear any accumulated debris. An easy to use drain plug allows this to be carried out.
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23. What do I do when the alarm goes off?
The advantage of the D-TX® Fuel Safe is the dash warning alarm, if this should sound, indicating water is in your fuel turn off the engine in question (if it is safe) and drain water from the unit via the incorporated drain plug. On re-start your Fuel Safe Dash Warning unit will initialize to show it is armed then go silent if all water has been cleared. If the problem persists, investigate the fuel supply for a major water influx (eg the tank has been filled with fresh water or you have just filled up with fuel and got a contaminated batch etc).
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24. I have aD-TX® Fuel Safe fitted and it has never gone off. How do I know there is no water in my fuel line?
If the dash warning initiates at start-up then goes out, no water is present. Open the drain plug to relieve any debris. Do this once a year, unless diesel fungus is prolific.
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25. Will the D-TX® Fuel Safe alert me to water in my generator’s fuel supply?
Yes, a unit between the supply and engine will allow you to monitor this real-time and alert you when water is detected. Many yacht owners overlook the importance of this piece of equipment. It may be the power supply to water makers, navigation systems and battery charging units.
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Purchasing the D-TX® Fuel Safe

26. Where can I buy the D-TX® Fuel Safe?
Simply call us on +64 (0) 9 4220454 or +64 (0) 21 1186257 or click here to go to the contact us page.
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27. What do I get when I purchase the D-TX® Fuel Safe?
The standard D-TX® Fuel Safe comes with all the components necessary for complete installation. This includes a single station dash warning plate, with additional dash plates available if required, wiring and connectors.
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28. What is the cost of maintenance and parts after installation?
Zero, there are no parts to maintain, replace or renew and maintenance is a very straightforward and quick draining procedure.
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29. How much does the D-TX product range cost?
Whether you are an owner, decision maker or in the trade please contact us and we will discuss your specific needs.
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