Dont know whether its the fuel pump or something else
Ok heres the problem i have a 1997 chevy tahoe with a 5.7 engine some times it acts like its not getting enough fuel it starts sometimes and sometimes it wont but if i spray some starting fluid in it it fires right up yeah to me it acts like the pump its not putting out enough pressure ant suggestions.
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Re: dont know whether its the fuel pump or something else
How did you determine its not the fuel pump?It could be the fuel filter but I dont think so.Your truck requires a certain amount of fuel pressure to start and a different amount to run properly.You would have to check what your fuel pressure is to say its not the pump.It should be something like 65 psi to start and 55psi to run.Even though you can hear the pump come on when turn the key it might not be putting out enough pressure to start the truck.I realize im a little late with this post but it might helpfull to others.
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DID YOU GET A GM PUMP OR A CHEEP AIRTEC PUMP,DID YOU HAVE TO SPLICE THE NEW WIRES THEY GIVE YOU,IF SO MAYBE ONE DIDNT GET CRIMPED WELL ENOUGH.ALSO CHECK FUEL PUMP RELAY UNDER HOOD.MAYBE SWITCH IT AROUND WITH ANOTHER ONE.IF YOU CAN REACH THE PLUG FOR THE FUEL PUMP GET A TEST LIGHT AND SEE IF YOU HAVE POWER TO IT ...IF SO THEN BAD PUMP RIGHT OUT OF BOX...BEEN THERE DONE THAT.
the pressure regulator may be leaking. pull he vac line and see if its wet. wet is bad. Also these fuel pump connectors are known to overheat from poor connections. Do a search on gm fuel pump repeat failures and overheating connectors. Also the fuel pump could be leaking down so the line needs to be primed. Try cycling the key about 3 to 5 times before you start it. The pump will prime for 3 seconds each time before shutting off. If this helps the problem is the fuel pump.
to remove the fuel pump you mus lower the fuel tank there ae two bolts on the back of the tank spray with wd 40 and use deep well socket 9/16 or 5/8 socket first lossen fuel hose clamp and over fill tube then unscrew the two bolts holding tank to vechicle, use a floor jack and a piece of plywood to lower the tank downone you have the tank on the ground tap the lock ring counter clockwise the tubes and wires come out of the center of the lock ring, tap it with a old wood chisel on two oppiste sides to get it to move once the ring is lose lift the fuel pump amd fuel sending unit out of the tank, replace fuel sock and o-ring on tank lube the o ring before installation and install in reverse proceedure replace main fuel filter, pull tank out and make sure there is no **** in the tank clen if there is. check the pickup tube for cracks. and put it back together and your set to go.
replace your MAP sensor(manifold absolute pressure) the map sensor is the computer for your fuel pressure regulator telling how much pressure. Unless your tahoe runs like **** going up hill than it inevitably your fuel pump
Hello, yes the check valve is in the fuel pump assembly. The check valve is leaking and the pump will burn out soon. Unfortunately the aftermarket fuel pumps can be very unreliable. A good portion of problems we see on this site are from people who replace the pump sometimes twice and it still doesn't work.