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Walbro 255 LPH Fuel Pump Kit
by Walbro
HP.Com Price: $103.97 Each
Item Number: WAL P528
Shipping Weight: 2 lbs.
Dimensions: 10" x 8" x 6"
Ships in 2 days
Customer Rating: Good Buy
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Walbro makes the same fuel pumps (as far as mechanical fitment is concerned) in two different styles. These styles are normally referred to as standard pressure and high pressure. This reference is a bit of a misnomer, since either pump will produce approximately the same amount of flow at standard fuel injection system pressures. However, well above the standard fuel injection system pressure the flow of the standard pressure fuel pump will drop off whereas the flow of the high-pressure fuel pump will see less impact. This is important to users who are trying to use higher fuel pressures to push more fuel through their fuel injectors than is normally done at standard fuel pressure levels. While this may be a cost-effective solution it can lead to other concerns, including safety considerations. Fuel-Pumps.net recommends that you use an injector that is able to inject the proper amount of fuel into the engine without requiring the fuel system's pressure to be increased significantly above stock levels.
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Determining how much fuel your fuel pump needs to be able to provide is no mystery. It's simple mathematics. The engine in your car takes in air and fuel and converts them to horsepower. The amount of horsepower your engine can make is a function of things like the size of the engine, the compression ratio, the boost (in turbo/super-charged applications) and several other variables. To make this horsepower, your engine will consume a certain amount of fuel. That amount is referred to as the "Brake Specific Fuel Consumption", or BSFC. The BSFC is generally estimated to be between 0.45 and 0.50 for most naturally-aspirated (non-turbo/super-charged) engines, and between .55 and .60 for turbo/super-charged engines.
By way of an example, let's say that you have a naturally aspirated car that makes approximately 200 HP. Using the more conservative BSFC of 0.50, your engine requires approximately 100 pounds of fuel per hour. Now, fuel pumps are typically rated in flow of volume over time and not weight over time, and so we convert this to an international-standard of 63 liters per hour by dividing by 1.58. For a turbocharged engine that makes 300 HP, we use a BSFC of 0.60 to come up with 114 liters per hour.
It is critical that the fuel pump in your fuel-injected vehicle is able to produce at least as much or more volume over time than the engine requires. If the fuel pump is unable to meet the fuel requirements then the fuel mixture will become lean and the engine will go into pre-detonation and will eventually destroy itself. Unfortunately, many stock fuel pumps are capable of providing enough fuel for only the capabilities of the engine as designed and installed by the manufacturer. Users who seek higher horsepower output from their vehicles increase fuel requirements. The stock fuel pump often becomes dangerously inadequate to provide fuel to the heavily modified engine. Since additional flow above engine requirements will simply be returned to the fuel tank, too much flow is a far better thing that too little.
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96-98 Elantra 1.8L (J2)
99-00 Elantra 2.0L (RD)
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00-01 Tiburon 2.0L (RD2)
98-99 Accent 1.5L (X3)
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