Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
good morning my name is ***** ***** I will assist
when the truck stalls after 40 seconds, was the fuel pressure still 50 lb
ok, then it does not sound like a fuel issue.
did you have the ignition module checked??? you can remove it and have it tested at a parts store for free.
yes, there has been times that we get bad new parts. just trying to be sure that it is not failing when it heats up
do you have any way to monitor data with a scan tool. Looking to see if you loose spark when it stalls.
did you clean the throttle body real well??? you may have a crank sensor acting up
what is the actual pressure???
thats not bad. I doubt you have 3 bad pumps. I would drop the tank and examine the internal part of the tank for any damage. if you have no volume, it originates at the tank
ok, you need to monitor the voltage when this is happening. it sounds like you are losing voltage with key on.
does it stay constant while running>>> we are looking for the voltage when it has the problem
that is telling me the pump is not working. this whole thing does not make sense.
did you replace just the pump or the whole module???
I am wondering if the is a problem right at the module between the sonnector and pump.
usually>> ok, but did you do it this time??
I wish I was there to help you. check the resistance from the top connector to the fuel pump itself
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ok, the light lights up but does it flash when cranking the motor. that will tell if the pcm is firing the injectors
ok, then the computer is working. you say there is fuel there. have you checked the pressure???
fuel pressure is good. do you have good spark??
pull a spark plug and see if it is fouled with fuel. do a compression test on that cylinder as well.
and the compression???
it is possible you have a bad spider unit. all the other checks are good.
ok, keep me updated
if the noid light is blinking as you say cranking, the crank sensor is working and fuel should be delivered into the cylinders since you have the pressure.
I am out of ideas here. I will open this up to the other guys to see if anyone has any better ideas
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HAve you checked your grounds at the pump connector?
It should have 2 grounds. They are very common for a ground wire breaking. Try running a separate ground wire to the black and black with a white stripe wires. They should be kitty corner form each other.
When you turn the key on what is your voltage at grey wire and then after it starts do you lose voltage?
The fuel pump relay runs the pump for a few seconds and then the oil pressure switch provides power. Check for power at oil pressure switch. Try jumping 2 wires on outside and see if it runs
It may not be driving the fuel pump though. Very common problem on these. You should have power at 1 wire with key on and engine off. Check that first. There are 3 terminals. Center is gauge and outside 2 run fuel pump
orange and grey wires run pump. Orange is power