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Old 06-19-2013, 11:47 AM   #9
jrh@lpe
 
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Drives: anything
Join Date: Aug 2010
Location: Decatur
Posts: 95
DI fuel pump

The L83 runs a mechanical fuel pump off of an extra lobe on the camshaft. The pump is mounted at the back of the engine in the valley. The pump is fed low pressure fuel by a PWM controlled electric fuel pump mounted in the fuel tank.

Here is an image of the mechanical DI pump as it sits in the valley of the engine:



During testing of the vehicle, we recorded fuel pressure levels in the high pressure side of the system of 425 psi to 2200 psi.

Fuel pressure in the low pressure (lift pump) side of the system ranged from around 40 to 90 psi averaging between 46 to 55 psi depending on the test.
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