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my buddy has an 06 vortec max. yesterday it just quit running. He thought the altenator was bad and it was when he had it tested. Once he replaced it the truck started and ran for 5 seconds. Now it wont start but cranks. battary tests fine. the fuel pump isnt coming on. he checked all fuses and replaced the relay for pump. Anyone had a problem like this? any help would be great. thanks
is the pump coming on at all an d are all the grounds connected?
Gently beat the tank on the underside, if pump turns on...bad pump.
change the pump, theyre known to just quit !!!
Does the gear indicators and SES light come on with the key in on (not in start)?
If not, check the small black with white stripe wire behind the intake on top of the block near the oil pressure sensor on the passenger side. Common rodent chewed wire that is the PCM ground.
Listen for the pump on key on at the filler with the cap off as suggested before. Yes, the tank smack works too.
is the security light on? May have to relearn the security system from the BCM to the PCM, syncronize them.
LOL Greg did Butch send you that himself? Got my new box in the mail today from him. I was having some hardware issues but used the opportunity to get new software as well...:dancenana:Quote:
Originally Posted by RedHeartbeat
replaced pump. truck started and ran for five min then cut out and wouldnt restart. fuel pump wasnt coming on again so he got another pump just to make sure that wasnt the issue. Still wont start. both pumps were from dealership. the bed is still off.
try straight wiring the pump to by pass all the electrical from the computer and wiring down the frame. if it pumps and runs then you will need to start on electric trouble shooting but if it doesn't pump then the pump is definitely bad and could be shorting out from a grounding out wire or something like that.
No way it's the pump if it's doing the same thing after 2+ REAL ACDelco pumps. Should have done diagnostics instead of shotgunning parts.
i've had three bad pumps in a row with a full tank of gas having to drop the tank. it was in a tahoe so i couldn't pull the bed up to check, but it can happen!
and by the way, they were ac delco too.
Wow. Replacing them all week for years and it's never happened to me but one thing we learn is anything is possible I guess.
yeah, and it sucked on the side of a road with few tools the first time, much less the other two times.