Author Topic: Fuel pump pulses with key on engine off.  (Read 5367 times)

Offline qwkswede

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Fuel pump pulses with key on engine off.
« on: April 16, 2010, 11:36:31 am »
I'm trying to diagnose a problem with my fuel pump output. When you turn on the key the fuel pump runs through its 2 second priming pulse, then I hear the relay click off for a split second and then the pump runs for another 2 seconds. sometimes this cycle repeats 5-10 times. Sometimes not at all. I suspected false triggers on my hall sensor tricking the ecu into thinking the engine is cranking. but I can't confirm this. The rpm gauge in VEMSTune never moves. There is no rpm signal in the datalogs.

Here is my current setup:
vemstune version from 3/08/2010
firmware 1.70
36-1 tooth wheel
hall sensor Hamlin Electronics. (maybe too sensitive?)
4 cylinder engine running wasted spark coil packs.

Thanks guys. I'm making great progress here with your help.
Project car: 1998 Volvo 745 Turbo - Aiming for 11s in 2010.
Blog: http://www.denverspeed.com/

Offline MWfire

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Re: Fuel pump pulses with key on engine off.
« Reply #1 on: April 16, 2010, 02:53:27 pm »
you have channel collision, can you upload your config?

Offline qwkswede

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Re: Fuel pump pulses with key on engine off.
« Reply #2 on: April 16, 2010, 11:50:59 pm »
Channel collision huh? The fuel pump output is like an error signal? Let me know if you see anything in here. I couldn't see anything in vemstune myself.

Thanks in advance...

http://denverspeed.com/Files/VEMS/!irene_test.vemscfg

That link should get you my config file.
Project car: 1998 Volvo 745 Turbo - Aiming for 11s in 2010.
Blog: http://www.denverspeed.com/