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Fuel Pump / Electrical Issue ?

AFTDRK

By AFTDRK,
in Engines & Forced Induction

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AFTDRK Rising Star

AFTDRK

Posted
Posted (edited)

Hello sau,

been having an issue with my car lately,

sometimes it starts, most of the time it doesnt

when i go to start the car, the starter motor works but the car wont fire up

ive had raa (roadside assistance) come to check it out, but they always say the fuel pump is faulty/does not work

which i do not think is the case as the car will somedays randomly start up (when i say randomly i mean 1 in 20 times), but whatever is stopping the pump from functioning chooses when to allow it to.

ive had a mechanic look at it and an auto electrician, both could not find any problems.

The car had done this before on my original fuel pump, which led me to believe i needed a new pump, but upon recent replacement to a walbro pump im having the same issue!

thanks in advance for any input

-p.a

Edited by AFTDRK
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https://www.sau.com.au/forums/topic/297641-fuel-pump-electrical-issue/
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James_03 Mentor

James_03

Posted
Posted (edited)

It really needs to have a pressure gauge hooked up to the rail and the pressure verified whilst cranking, can you confirm this has been done? Just to make sure it's not something still FP related by some small chance.

If pressure is OK, then I would be leaning more towards an electrical issue, if it's running stock ECU put it into diags and check for fault codes whilst cranking.

When it does start that 1/20 times, does it run rough? Give us more info in regards to that.

Edited by James_03
Beer Baron Grand Master

Beer Baron

Posted
Posted

certainly sounds like fuel pump. take it to a mechanic and have them test it. then you'll know for sure. it shouldn't cost more than half an hours labour to test a fuel pump. so for around $40 you will know if that's the problem or not. personally I've seen a lot of problems with people putting walbros in their skylines. most often they are not fitted properly and just floating in the tank, and sometimes even when fitted to the tank they are still not installed properly. improper install will see them fail fairly quickly.

AFTDRK Rising Star

AFTDRK

Posted
  • Author
Posted
It really needs to have a pressure gauge hooked up to the rail and the pressure verified whilst cranking, can you confirm this has been done? Just to make sure it's not something still FP related by some small chance.

If pressure is OK, then I would be leaning more towards an electrical issue, if it's running stock ECU put it into diags and check for fault codes whilst cranking.

When it does start that 1/20 times, does it run rough? Give us more info in regards to that.

when i do manage to get it started it runs fine, starts up like normal, drives as per usual

STATUS Grand Master

STATUS

Posted
Posted (edited)

I just had this with cats Rb26, turned out to be the CAS. Everytime i CBF diagnosing it it would start then when i needed to move t in a hurry it would not start :D Listen to hear the fuel pump prime for a bout 5 seconds once you turn on the key. If you cant hear the pump, its probably the pump. Walbros are a common failing pump, they hate voltage drop.

Edited by URAS

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