1998 1500 Z71 cranks and starts when carb is primed. Won't stay running. How can I tell if the fuel pump is operating. is there a fuse? I see a fuel soleniod fuse block - does that power the fuel pump.
If it is a electric fuel pump take the fuel line off carburator and get a three foot gas line hook it up to the gas line on the car run gas line into an empty gallon container and turn key on and see if you are getting a good flow of gas
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remove the lift pump and make sure its not on the back of the cam ,it will never work like this ,then remove the pipe from the carb end and try putting some fuel down it to prime and wet the valves inside the pump ,if that doesnt work check for a porous pipe froim the tank to the metal pipe that runs to the pump ,if that doesnt work then look inside the tank ?
if the vehicle cranks and will not start, but when you cycle the keyon and off with a few second interval. by doing this you are priming the fuel line, if it starts after priming the system then i would look into the fuel system. would need to know exact details to give a more pin pointed answer
try spraying some carb cleaner into a vaccum hose and see if it will run. If so then you have ignition but no fuel delivery. If not then you have an ignition problem. make sure you hear the fuel pump hum when you turn the key to the run position. It should run for +/- 5 seconds then shut off. remove gas cap and listen for fuel pump operation through the fill hole. If you can hear the pump then you have a fuel injection issue. If the engine starts and runs for a few seconds then shuts off then you can suspect the crank or cam position sensor. The fuel pump runs through the oil pressure switch which could also be an issue.
Are you able to start the truck with application of the gas pedal?
do you mean the truck won`t start and run or do you mean it won`t turn over with the key.if it won`t turn over with the key the you may have a starter problem.if you mean won`t start then it could be the fuel pump not working.with someone cranking the motor you should hear the fuel pump running with the gas cap off and listening at the filler neck.or hear it running listening under the truck at the gas tank.if you don`t hear it then you can hit the tack sharply with your hand or a rubber hammer,it hear the pump start to run then the fuel pump needs replacing.if not check the fuses under the dash and under the hood.if they are good then it may be the pump relay in the relay box under the hood and it should be marked on the box or lid.