snarl95: Thanks for the come back. Gauge is connected to the fuel line...............Then to the new Leroy fitting on top of the fuel filter.
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Replace seals at fuel sender unit. Better yet, replace sender and the fuel lines from sender to Lift Pump. You suck in air back there and it creates air in the system and starting problems. Been there twice on these vehicles in the last couple years.Gen-
He only has it when cold starting and there is air coming out of the ip inlet the return line so air is not the issue.
If it’s air getting in the fuel system overnight. Heat has nothing to do with the confirmation of anything. It is all about the purging of air in the fuel system, which then leaks down again after sitting overnight.With heat confirming the long crank time getting better, after testing each wire to the GP's and confirming 12+ when not connected, then it could be that you need more GP run time. the factory PCM was programmed at GM for the 11g GP's which get hotter quicker, but they burn out fast too. a double edge sword. try rigging up something to bypass the GP controller weather you use a screwdriver shorting across the controller contacts or wire in a second solenoid and a push button in the dash to do the same.
key on and let the PCM do it's thing with the wait to start, then manually override turning the GP's on for another 8 to 10 seconds, then crank and see what happens without the block heater.
Getting a bubble overnight.Says he's not getting any air in the return line
I'm not positive that is necessarily true.For it to take 5 seconds to come up to pressure there should be a massive amount of air at start up. He says no.
I agree.5 seconds should indicate that it's taking that long to refill everything. If it only lost pressure it should build pressure immediately