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Did change fuel pipes and clamps and diesel don't run back 4 to 5 pumps on prime pump and it is hard. Saw oil presure wire not on switch but even if I put it back no difference?

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6ya6ya
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Posted on Jan 02, 2017

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Centaur89
  • 7 Answers

SOURCE: fuel pump 2000 chevy blazer

Check your connections. did you run the fuel pump wiring under the drivers side door sash like GM did?.. if so check for nicks in the wire or bending or cracks.. this happens.. happened to me. check your fuel pressure. 40 dollar part at an auto store. If its below 59 PSI it wont work. And blazers are very intolerable to low fuel pressure. Also try taking the negative post off your battery for a little while and then putting it back on and if you can get it started again drive around (if its safe and running decent) for at least 30 minutes to get your car computer system acclimated to a new functioning part. Did you check the fuel filter?. rule of thumb when a pump goes change the filter its always the last thing people expect because we all jump to catastrophic engine failure at the first no start moment. lol.
Make sure that all your ducks are in get my drift.. Air oxygen fuel thats the mixture you need to check all those vital parts. before pulling your head off.

Posted on Aug 08, 2008

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SOURCE: priming fuel system on a 8.1L diesel engine 2001chev 1 ton dual

Well, one problem is, if its an 8.1, its not a diesel. The 8.1, or Vortec 8100, is a gas engine. The DuraMax is a 6.6 engine. There is usually not a priming system on a gas engine, because the fuel pumps will usually get it through the smaller filters used quick enough you dont need them. However, if it is a DuraMax engine, then right on top of the fitting where you mount your diesel filter, there is a primer pump and an air bleed valve. What you do is, open up that air bleed valve ( its a little black plastic octagon shaped thing on the top of the filter mount) then you pump the primer (the silver button looking thing) until you get diesel squiting out the air vent without too many air bubbles or gurgles.

Posted on Jan 23, 2009

asetech74
  • 218 Answers

SOURCE: 1999 landrover range rover 2.5 diesel put petrol

I would start by looking for the valve on the fuel rail (or at the filter housing), if you disconnected the fuel pipe from the filter feed you will have a lot of air in the system (and diesels do not like air in the feul system) you will need to have someone crank the motor over while you push in on the schrader valve to release the air out of the system until you get fuel to flow steady out of that port (this may take a short period of time), then you should be able to start the vehicle... would also recommend replacing the fuel filter as well. Hope this helps.

Posted on Mar 10, 2009

DAD5bbbbg
  • 111 Answers

SOURCE: 1993 saturn sl1 car runs great then quits for no

Try changing your fuel cap.

Posted on Apr 05, 2009

lsteward68
  • 331 Answers

SOURCE: i can get power th the fuel pump when i run a hard wire from the battery to the relay but when i put the relay back in no power to the fuel pump

I have a question. Turn the ignition on you should hear the pump for about 3 seconds. then it should stop. this is normal operation. then when a signal is sent to the ignition that you are going to crank it then it switches on. I can see how this can seem like the pump is not working but after you crank it you should be able to hear the pump for about 1-1.5 seconds after the crank then it will stop. The pump will not turn on until it is told to do so by the computer.

Posted on May 25, 2009

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Fuel pump won't cycle when the key is turned on 93 Chevy astronaut 4.3 eng


For initial prime, you have to check fuel pump relay and wiring circuits. The control/coil side of relay gets voltage from pcm, green wire with white tracer. The ground for control side of relay, should be a chassis ground. Voltage for load side of relay is fuse protected.
This vehicle has an oil pressure switch in fuel pump circuit, just a redundant power supply to the fuel pump. Even w/o the relay the vehicle should start and run, once the oil pressure builds up and that switch closes, the fuel pump will get voltage. There won't be any initial prime w/o the relay.
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WELL MOST BOBCATS NOW HAVE ELECTRIC FUEL PUMPS NOW , SO REPRIMEING FILTER IS EASY YOU JUST KEEP CYCLING KEY (NOT TO START) WHEN FILTER IS PRIMED (NOTED IN PITCH CHANGE OF FUEL PUMP SOUND) THEN YOU CAN LOOSEN ONE INJECTOR SUPPLY PIPE (NOT REMOVE) TILL A HINT OF FUEL DRIPS OUT OF IT , CRANK ENGINE TILL IT TRYS TO START , THEN STOP AND TIGHTEN THE INJECTOR PIPE , THEN START NORMALLY ALLOW TO RUN FOR A FEW MINUTES BEFORE RESTORING TO SEVERVACE EVERYTHING
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It could either be a fuel pipe between your prime pump and injector pump that sucks air so your diesel flows back into your fuel tank. Or you need to replace the prime pump.There is a rubber diaphragm in the prime pump that gets worn. Unfortunately need to buy a new prime pump. A simple sollution is to fit a non return valve to your fuel line. That need to be connected between the prime pump and fuel tank. Hope it helps. Blessings

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1 Answer

Low voltage at fuel pump


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The engine is a 12ht turbo diesel 85 modle hj61 land cruiser. engine will start, the base idle is low and runs rough RPM aprox 600. wind up base idle with idle screw to 1000 runs good but u can take turn...


Check to see stop solenoid is working, you may be able to do this by getting someone to turn the key on and off slowly while you are hold your fingers against the side of it.
It is the small metal (Nut) with a wire going into it for an easy description.
The reason you have to choke the engine to stop it is you have either no power going to the switch or the switch is not working properly. i would think more that the switch may not be working properly as it is meant to close fully when power is turned off, if this was working it doesn't matter how much the motor is reving it will still shut of the fuel to the pump.
Sometime these solenoids get a bit of dirt etc stuck in them s well, this is usually just a easy fix,clamp the rubber fuel line before the pump, undo the switch, clean it and refit it, then undo the clamp and prime the pump using the hand primer.
Then start the vehicle, don't try to start the vehicle before you have reprimed the pump as you can damage the engine if you don't have fuel going into it.
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Dont rush working on a diesel, just take your time mate.

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