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The fuel pump is controlled by the ECM which receives a signal from the fuel pressure sensor . When the pressure is reached the sensor signals the ECM and the power to the pump is reduced / stopped until the pressure falls . Have a fuel pressure test done on the manifold to check fuel pump--pressure regulator and filter. Run fault codes to check for correct venting around the canister.
hi u will probably find under the bonnet somewhere a fuel filter and or a housing that contains a bowl of somesort and on the bottom of it should be a bung, unscrew it anticlockwise and drain the water out, drain it until u can see and smell fresh diesel it usually takes quite a bit of water usually upto a cup or so to trip the light or a message so only drain out about 2 cups or so or u will have difficulties trying to start it, also there may be a primer button on the same housing or somewhere else that if u find it just pump it until it goes hard then start it up and and hold the revs and 2k or so for a half a minute or so and away u go, it may stop after immediatly after starting try starting again but avoid cranking for any longer than 10 or 15 seconds then give it 30 senconds or so and try again it should start if no go after 2 or 3 attempts and u found the primer button try priming until it goes hard again and follow this again, if not just leave it a little longer between attempts and you will slowly purge the air out of the system
this could be several things. ours is in the shop now; the problem was the wiring harness to the fuel pump has an open circuit; and good luck figuring that one out-- not the best wiring design. but, if this is your problem, you should correct it quick, before the poor voltage going to the fuel pump burns up the pump motor-- list $$$$ on the pump is +/- $400. while you are trying to start the truck, you can hear the pump starting for two seconds, to pressurize the lines, then it stops until u crank the engine. have a helper crank it over while u stick your ear on the tank [ no im not kidding] and listen for the pump running. if u dont hear it, then the pump isnt getting power. check the relay, then check for continuity in the harness.
They are not related. If the belt broke, the water pump would stop pumping, the car would overheat, power steering would quit, battery stop charging, etc, but just 'needing to be replaced' means that the above will happen if the belt fails. Your oil pressure is provided by the oil pump, which is not dependent upon the serpentine belt. You should remove the oil pressure sending unit, crank the engine over, run it briefly (10 seconds), you should have oil spewing out where the sending unit was. If not, there most likely is no oil pressure, as indicated by the red warning light. Always assume the oil light going on indicates there is no pressure, and turn off the vehicle immediately. The risk of continuing to drive the vehicle will result in severe engine damage. I hope this hasn't happened, but be prepared for the worst.
hi i have a 1997 chevy tahoe that starts but won't stay running i have changed fuel pump, fuel filter,relay ,spark plugs, and just changed rotor and dis. cap ready need some help to figure this out please.