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No fuel to the throttle body i have replaced the fuel pump, filter, and relay nothing even took a test light to the injector wires and they are fine as well as a new ground and checked my fuses. could it be my computer? why will my pump not turn on? can i reset my computer some how? 93 s10 2.8 5 speed
Re: No fuel to the throttle body i have replaced the fuel...
It could be the power wire to the pump. Try running a power wire from the battery to the pump. It should turnm on for a few seconds and shut off until you start the truck. Hope this helps.
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What make vehicle do you have ? Some makes incorporate a FPDM - fuel pump driver module . Fords have a inertia fuel cut off switch. I suggest you go to youtube an check out some basic electrical trouble shooting videos an then go to www.bbbind.com for a wiring diagram an check the fuel pump electrical circuit . Here is a video testing a GM fuel pump circuit . just for instance . GM Fuel Pump Relay Testing If you want to work on modern vehicles you really need to lean basic testing procedures . Not just replacing parts.
Yes, there is a Fuel Pump Relay. The Relay is located on the firewall just above the left-hand (even cyclinders) valve cover as viewed from the front of the car. There is also fuel pump test lead attached to the harness at the fuel pump relay. Attach a power wire from the battery to the lead and the fuel pump should come on. If fuel pump comes on, the relay could be bad. Also check the fuel filter located under the passenger side of the truck tucked into the frame rail.
Can you here the fuel pump running?no, check fuse,and pump relay. Check pump fuel pressure,at the fuel injector rail,or throttle body. Check for voltage at the top wiring on the fuel nozzel.While cranking look for pulsating voltage.None, test computer,scan system. let me know the outcome.
If you have a throttle body, then you most likely have to injectors inside the throttle body. Check to make sure that they are funtioning correctly. You can check by using a voltometer and testing the injectors' lead wires for an electric signal, there should be one. Also, check to make sure your fuel filter is not completely stopped up, it happens. Also, sometimes the fuel pump can turn, but not put out enough pressure to start the car. There is also a fuel pressure regulator on many late model vehicles that can malfunction. I would check that as well.
Fuses first. Then, disconnect the fuel line at the throttle body (unless there is a fuel pressure testing port) and see if there is fuel when you turn on the key. If not, fuel pump, probably in tank. (assuming there isn't one on the side of the engine..) If there IS fuel in the line, then the computer may not be engaging the injectors. Check for wiring issues on something that old. Maybe the main junction splice for power to the computer. (Not sure where on that one, sometimes it's in a dumb place, like near the battery and it gets corroded).
check wires at throttle body. can use a 12 volt test light to check for current. if you have spark it is not the ign module. set meter for 12-20volts. should have 2 fuse boxes on this model, one behind right side of dash at floorboard
replace the fuel injectors, that is the likely cause......
to test the injector, take the power clip off the top of the injector, take one wire and ground it to the body of the car, and another form the battery, to the other post on the injector, if you do not hear a pulsing sound coming from the injector it is bad, if you do, then you have a wiring problem.
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