Typically fuel tanks are usually mounted at least two feet below and ten feet away from the fuel pump. This configuration creates multiple problems associated with the fuel delivery to the engine. First, the injection pump has to draw the fuel from the tank by creating a vacuum. When diesel fuel is drawn by a vacuum fuel vapor is produced. Second, while the vehicle is underway the fuel is sloshing around in the fuel tanks creating entrained air.
By having entrained air and air vapor in the fuel the engine does not perform at the engines best. Air and fuel vapor occupy the space that should have pure fuel, thus delaying the injection of fuel into the combustion chamber. This phenomenon is better known as "Retarded Timing." Air/vapor present in fuel is very inconsistent also causing varying degrees of changes in injection timing.
PDR recommends it is best to not have more pump (rating of GPH) than what is needed for a given application, as the pump will live a shorter life by bypassing more than normal. For example: A stock engine to 600rwhp truck should run a 95gal per hr pump, as a 150gph pump would not benifit the engine at all. Under 600rwhp the engine just isn't capable of using that much fuel and would be bypassing it's life away. Also the 150gph systems tend to be louder units, which can be anoying for a everyday driver. 150gph or higher units are for the extreme hp aplications only.
Considering the poor quality of the Dodge's stock transfer pump and the damage that can be done, FASS has the solution and with up to a 6 year warranty, FASS can't be beat. |
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