I have 1988 chev c1500 V8 5.7. Truck turns over but will not stay running. I put fuel in the carb & it fires rite up but then quits. I took it to a shop & they replaced fuel pump, fuel screen, fuel pump relay,fuel filter, the fuel sending unit. & still will not fire up. PU turns over. What next do I look for??????

Is the fuel pump turning on? If you don't hear it turn on try banging the actual tank with a rubber mallet while someone tries turning the key. If it it does turn on, it's definitely your fuel pump. I can walk you through changing it if it comes to that

check your fuel flow and pressure.
check that your injector(s) aren't clogged
check your map or maf sensor

Does it start right back up ?
Are you loosing spark to the plugs or fuel to the injectors ?

Fuel pump it's in the tank there good for that

Have to remove intake manifold, to replace
pressure regulator and spyder assy

I had one with the coolant temp sensor telling the ECU is was -40 in July. Replaced the sensor, was fine after.

Try a new fuel filter. If that doesn't help, check the fuel pressure--may be a plugged intake sock filter inside the fuel tank.

try running the vehicle without the feul cap and see if it quites or keeps running.

The filter you chg. an inline filter? Is there a filter in the carb.where fuel line connects, some had a brass screan in the carb. you can chk. the fuel pressure without it running, just unhook line at carb. put it into a plastic bottle or something to catch it and have someone turn engine over if it squirts out good thats enought for it to run they only put out about 6 to 8 lbs. of pressure. I don't think that solenoid would keep it from running, when it will run on either. but maybe if you unplug it and see what happens. It suunds to me to be a fuel dilivery problem, either something restricting the flow to carb. or you got a bad pump.

I put a new fuel pump, fuel filter, and a fuel pump relay and the fuel pump is still not coming on. I am not getting any fuel. Can you please tell me what it might be.