Everything Seems To Work... ... ... Fuel System on 1990 GMC can be complecated, to say the lease... Still no fuel, into the Throttle Body. Who's Ideal was that? was this just a bad deal for me? I see on line , Many of the same problems with this truck... Is there any ONE out there who has put this fuel problem with 1990 GMC to rest, Please pass it on... I know about the Pressure test. Help, Help, Help, Please.
Old carb type do suffer from flowt problems, also people dont change the filters regularly so the inline carb filter blocks up., you would need to remove the carb and take the float chamber housing off. check the condition of the floats, and check the valve, if there is what looks like wet/dry dust in the float chamber then the filter has failed and you will need to clean the jets, you will need a few cans of carb cleaner or a big can of spray to clean it out. change the filters depending on carb fitted, there can be a filter above the valve or the fuel in line to the carb, also the main filter. replace the seals and refit when clean, would also at some point remove the tank and clean it out.
SOURCE: 1996 GMC Sierra 1500 truck fuel problem
Have you check the injector relay or maybe a fuse for injectors.
SOURCE: 1998 GMC Sierra- runs rough then stalls when
had this problem on my neighbors 98 chevy truck with the same engine !!
it turnd out too be the fuel pressure regulator,you have too pull the upper intake too replace it!!
SOURCE: My problem is my 1990 GMC Sierra was running then
You need to do a fuel pressure test on it. You also need to test the injectors w/a noid light to see if you have pulse to the injectors.
SOURCE: 2001 gmc sierra 1500 not getting fuel
remove fuel line from throttle body and have someone try to start. If no fuel is "shooting" out of line, there is a block. clean out line or replace.
SOURCE: I have a 1989 GMC sierra 4.3 Liter, fuel pressure
u can do the check the other way around/ disconnect the fuel line that supply the injectors/ put the pipe in a small plastic container to see if fuel is being supplied by the pump and avoid fuel spill in ur engine/ crank the engine for at least 5 seconds see if the fuel squirts with pressure/ if it does then ur fuel pump is ok / blockage is somewhere down the fuel line/ u can check fuel lines by blowing it with air but u gonna need the help of an air compressor.....
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