AEB: longer cranking after fuel pump change
04-13-2014, 09:32 AM
#1
AudiWorld Senior Member
Thread Starter
AEB: longer cranking after fuel pump change
We were thinking we were running out of fuel pump capacity (fuel pressure gauge showed drop at WOT and higher RPM).
Upgraded to AEM 320lph. Since then
- need longer cranking to start
- run dry at about 1/4 on the fuel gauge
Any tips what might be causing the 2 symptoms?
Once had 'longer cranking' case (different car), traced it back to (assumption) new pump not having a built in 'check valve' that closes the supply line and maintains pressure in the fuel system (despite the manufacturer saying the pump HAD a check valve).
Could it be the AEM pump also does not have a suitable check valve, and allows the fuel system to depressurize when key off (and taking longer to pressurize when cranking)?
"Dry at 1/4 tank": I assume the pump (comes with foam spacer) does not slide down low enough (there is a 'step' in the OEM basket)?
Upgraded to AEM 320lph. Since then
- need longer cranking to start
- run dry at about 1/4 on the fuel gauge
Any tips what might be causing the 2 symptoms?
Once had 'longer cranking' case (different car), traced it back to (assumption) new pump not having a built in 'check valve' that closes the supply line and maintains pressure in the fuel system (despite the manufacturer saying the pump HAD a check valve).
Could it be the AEM pump also does not have a suitable check valve, and allows the fuel system to depressurize when key off (and taking longer to pressurize when cranking)?
"Dry at 1/4 tank": I assume the pump (comes with foam spacer) does not slide down low enough (there is a 'step' in the OEM basket)?
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