Diesel Fuel Pump

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Diesel Fuel Pump
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Just about every automobile on the road today with a gas motor is equipped with an electric fuel pump. If you own a car; chances are it has an electric fuel pump.

Prior to fuel injection there was the carburetor. Carbureted engines had a mechanical fuel pump mounted on the engine. This style of pump usually was driven off of an eccentric lobe on the camshaft.

Carburetors did not need a lot of fuel pressure to feed them; in turn created a small problem with this style of setup. The combination of low fuel pressure and heat generated either by the engine and/or outside ambient temperatures (hot weather) or the combination of both; caused the fuel to vaporize (vapor lock).

Mechanical fuel pumps were not designed to pump vapor. Vapor locking caused the vehicle to spit, sputter and sometime just die; when the engine finally cooled down then the vehicle would start up just fine.

Most electric fuel pumps are located in the fuel tank of your automobile. There are several reasons why the manufacturers mounted this style of pump in the fuel tank:

o When fuel injection came around; this system required higher fuel pressures to function properly. Electric fuel pumps were designed to pump fuel at high pressure. The combination of higher operating pressures and mounting these pumps in the fuel tank; eliminated any possible vapor locking.

o Keeping the fuel pump submerged in fuel; keeps the pump cool and allows a constant supply of fuel to the engine. Plus; with the fuel pump submerged in fuel, there is a least likelihood of an explosion. Liquid fuel does not explode, fuel vapors do.

o The benefit of having a fuel pump mounted in the tank is that a suction style pump at the engine could suck in air through a bad connection. This is a hard problem to diagnose, but a leaking connection in a pressurized line is a lot easier to see.

A potential hazard of electric fuel pumps is that all the lines are pressurized from the tank to the engine.

Although mechanical fuel pumps may be safer than the electric fuel pumps; (because of the lower pressures required for mechanical fuel pumps) they are also cheaper to purchase and replace compared to the electric fuel pump.

Here are two reasons why electric fuel pumps are more expensive to replace:

o Component: The electric fuel pump is a more complex component compared to the old mechanical pumps. Buying an electric fuel pump over the counter from your local parts store will vary depending on the make and model of your vehicle. An aftermarket brand pump will run somewhere between $75.00 to $150.00, that's being conservative. Buying a genuine manufacturer pump will run you considerably more.

o The fuel tank usually has to be removed in order to replace the fuel pump. This procedure requires a lot more time and labor. Having your local repair shop tackle this procedure will be quite expensive.

One of the hard facts to remember is that most electric fuel pumps prematurely fail due to improper maintenance. This fact reference comes from 20 years of being in the automotive and truck industry.

Here are Robb's top three reasons why electric fuel pumps fail prematurely; in order:

o Plugged Fuel Filter: Unless you have a local shop who takes care of all your vehicle service and maintenance; most people overlook replacing the fuel filter.

Many people don't even know that a fuel filter exists on their vehicle. As the fuel filter becomes more restricted through time; the pump has to work harder to push fuel through the system.

The more restricted the filter becomes the harder the pump has to work, eventually burning up the fuel pump. Replacing the fuel filter every 15,000 to 20,000 miles will help get the longest life out of your electric fuel pump.

o Running Off The Low Side Of Your Fuel Tank: Constantly running your vehicle below a ¼ tank causes the fuel pump to overheat. Remember earlier I mentioned that having the pump submerged in fuel keeps the pump running cool.

Filling your tank up before it gets below a ¼ is a good habit to get into. It will also prolong the life of your electric fuel pump.

o Cheap Fuel: Fuel that has an ethanol blend in it is usually cheaper to purchase at the pump. Your vehicle may not be equipped to handle ethanol blended fuel.

There is usually a tag or sticker under the hood that will specify if your engine is equipped to handle ethanol blended fuel. If you own a newer vehicle, (year 2002 and up) this should not be a problem; I would refer to your owners manual just to be sure.

Ethanol blended fuel does not have the lubricating properties to keep the fuel pump and system o-rings and seals properly lubricated. Higher octane fuel (more expensive fuel) has these lubricating properties.

I suggest adding a fuel additive to your ethanol blended fuel if your vehicle is not equipped to handle this kind of fuel.

I hope this article was informative and my tips and recommendations are helpful. I know what it cost to bring a broken vehicle in the shop to be fixed, it's not cheap.

Supplying you with a little more understanding and knowledge about your vehicle and electric fuel pump will help keep your vehicle out of the shop. You will also increase the life of your electric fuel pump if you decide to follow these guidelines.

If for some reason your fuel pump does fail and it has to be replaced, at least you will have the knowledge to understand what is going on and be able to relate to what the Service Manager is explaining to you.

Hello, my name is Robb Ellermeier, I am an ASE Certified Diesel Mechanic. I have been in the diesel and automotive industry for nearly 20 years. My website "My Wife's Auto Salon" is a dedicated site for women who want to learn more about their automobile and simple maintenance procedures. My wife actually encouraged me to set up my site for this very purpose. She understands fully how vulnerable she has felt in the past when she was single and needed repairs done to her car. I understand the importance of trusting someone repairing your vehicle. Quality is the key to any success and my site is dedicated to giving quality information and services to you ladies who may need help or advice. Feel free to come and visit at http://www.robbs-outdoors.com

Understanding Diesel Fuel For Your Trawler

Trawler and motor yacht owners enjoy the sound of our diesel engines; like music to our ears.  The diesel engines are the heart of any boat.

But problems can take place with diesel fuel stored in your trawler's fuel tanks, affecting those diesels?

It is important to know what diesel fuel is to begin with.  Diesel fuel is processed from crude oil. In oil refineries, petroleum is heated, and different hydrocarbon molecules are extracted to make the fuel. Diesel is much thicker than gasoline and vaporizes much more slowly. It's frequently referred to as "fuel oil" because of its consistency.  Often forgotten, diesel is an organic matter.

"Provide a diesel engine good fuel and it will last forever and a day." This old expression is less of an exaggeration than you might believe.  Repair statistics record that 90% of trawler diesel engine problems stem from contaminated fuel. The promise of doing away with 9 out of 10 potential failures should put fuel-system maintenance at the top of your list.

The most frequent signs of fuel contamination in a yacht are blocked fuel filters, and decreased engine performance. However, the lack of these conditions does not inevitably suggest that your diesel fuel is not contaminated. In fact, it is probable that every trawler's fuel is moderately contaminated.  Diesel Fuel pick-up tubes, where the diesel engine draws fuel from the tank, typically sit about three-quarters of an inch off the bottom of your fuel tank floor. This placement is designed to protect the engine from contamination that has settled to the bottom of the fuel tank. Therefore, you may never recognize that you have a fuel contamination problem until the fuel is agitated in some way - such as when you are in rough waters in your trawler.

Moisture can get into trawler fuel tanks in several ways – by condensation of wet outside air, during transport from refineries to distributors, by leakage through broken fill pipes or vents and by careless handling. Water can cause injector nozzle and pump corrosion, micro-organism development and fuel filter plugging with materials resulting from the corrosion or microbial growth. Your trawler's fuel/water seperators should be inspected frequently for water and drained as necessary. In freezing northern winters, ice formation in fuels containing water produces severe fuel line and filter plugging problems. Regularly removing the water is the most effective way of preventing this problem; however, small quantities of alcohol may be used on an emergency basis to preclude fuel line and filter freeze-ups.

Regular diesel fuel filter exchanges and the costly and time consuming task of cleaning diesel fuel storage tanks have become acceptable routine maintenance instead of looking for a warning signal for diesel engine failure. Diesel fuel filter elements should last several hundred hours or more and injectors some 15,000 hours. Even So, since diesel fuel is inherently unstable, solid matters begin to form and the accumulating storage tank sludge will eventually clog your diesel fuel filters, possibly ruin your injectors and cause diesel engines to smoke.

Fuel stored in vessel tanks for long periods (6 months and more) demands special care. This diesel fuel suffers from multiple issues that influence its quality. The presence of free water supplies the medium for microbiological development that result in the formation of slime and acids inducing corrosion of metal surfaces such as storage tanks, pumps, injectors, etc. Left neglected this water layer will entrap sludge and become the breeding ground for microbes, fungus, yeast and more. This poisonous mix produces acids that compromise the integrity of your storage tank, lines, pumps, fittings and worse, diesel machinery.

Another crucial factor leading to diesel deterioration, is mechanized stress caused by heat and pressure of pumps. Since most diesel engines return substantial amounts of fuel back to the tank, it is simple to see that the engine itself adds to fuel deterioration.

Bugs in the form of bacterium and fungus are present in all diesel fuels. Extended periods of fuel storage can create ideal opportunities for microbes to grow in fuel tanks. The first suggestion of microbial contamination is mucous-like collections on fuel-filters. Bugs can only be removed from the fuel system by polishing or by forbidding their occurrences by use of a diesel fuel biocide such as BioBor. I highly recommend it.

Should you use diesel fuel additives?  There are many of additives on the market nowadays that are designed to improve the operation and efficiency of diesel fuel.  I opt to use Marvel Mystery Oil.  However, if you use the right additives, you can reach peak performance from your fuel every time.

Trawlers typically have primary fuel filters and a set of secondary filters installed; Racor is a good example.  Every time the diesel engine is operated, the diesel fuel is polished by filtering and returning fuel back to the tanks.  A separate polishing system can also be installed that filters the fuel independently of the engine operating.

About the Author

Mike Dickens, the author, is a boat owner and owner/Broker of Paradise Yachts. Paradise Yachts is a Yacht Brokerage offering used yachts to customers worldwide. Visit our website to view our selection of Used Trawlers, Used Motor Yachts, and Used Sailboats . National and international sales. We ship Used Yachts and Used Boats worldwide. Located in Florida, USA. 904/556-9431

can i remove the turbo boost diaphragm on a diesel injector pump safely, it controls rich fuel mix for turbo?

Its a 1999 TF series holden rodeo turbo diesel an the crankcase vent had let to much oil into the air-intake, this was pushed up by the turbo into the manifold where the small pipe is taken off to control the fuel richness in the injector pump, this little pipe was blocked and i don't know the condition withing the diaphragm control, is it safe to remove the top off it or is it under pressure.

no dont do it

‘Big Three’ slashes fuel prices
After enforcing mixed price adjustments on fuel last week, the country’s “Big Three” oil companies this time reduced the price of all their fuel products.   Bobby Kanapi, spokesperson for Pilipinas Shell, said that the company pulled down gasoline prices by P0.50 a liter and diesel and kerosene prices by P0.75 a liter. The oil giant’s rollback took effect at 12:01 a.m. on July 5, 2010 ...

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