I have a 2002 GMC Sierra 1500.
The truck had stopped, and it appeared to be the fuel sending unit
That unit is a canister containing the fule pump as well, and goes for about $400 retail.
To get the truck back on the road temporarily,
We changed the fuel pump (not the whole canister) and %26quot;hot wired%26quot; the fuel pump to a switched ignition 12v (fused) source.
The first time this was done, it worked fine for 1 week
(the pump burned out) .
We bought a new fuel pump and tried again.
This time, its working, but it takes 3-4 cranks before it starts.
It seems that the fuel pressure must be off, but we have no way to verify this.
1) What does the sending unit do ?
2) How many volts is the fuel pump?
(i checked the voltage at the sending unit and it was only 5 volts)
Any ideas for a solution ?Fuel (pump?) problem on GMC Sierra truck?
It's not the sending unit. All the sending unit does is control the fuel gauge. It looks like a toilet bowl ball...it measures the level of the fluid in the tank...same thing for the sender...it floats in the tank and measures the level of the fuel.Fuel (pump?) problem on GMC Sierra truck?
you say it works ok now but you have to crank it over before it starts ? did you bleed the air out of the lines and change the fuel filter ?Fuel (pump?) problem on GMC Sierra truck?
Don't remember that vehicle having one , but it sounds like a puller fuel pump . Think if you check , you also have a pusher pump in the tank . also found this on the web :Really sounds like a fuel pump to me.
The Z motor pumps were really bad. This is what I think you should do.
Take your vehicle to a GMC dealership and have them run a VIS. This will tell them if unit is eligable for a recall they had in 2002 model vehicles for the fuel pump connector.
If you have already had it done, have them, or your usual mechanic hook a fuel pressure gauge to the unit and drive it around until or while it acts up.
If you see the fuel pressure slowly dropping off, it is the pump
