Question about 1996 Chevrolet Impala SS

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1990 chevy truck fuel pump doesnt have full voltage

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I would start with checking the fuse and relay for that circuit. If that is fine then you will want to check the oil sending unit. If the sending unit breaks, the fuel pump will not work. Please state as much information as you can. Please write back with everything that you have tested and noticed. I will do my best to help. good luck.

Posted on Mar 04, 2014

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Posted on Jan 02, 2017

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freetek
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SOURCE: install fuel pump on 1996 chevy 1500

Is the fuel pump really bad?

Our son's erstwhile Ford something had a shock sensitive switch that when tripped by a big pothole, shut the (electric) fuel pump off and had to be reset before it would function again.

Posted on Jul 02, 2008

mas66
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SOURCE: '88 chevy truck, no spray from injectors

Not sure on that model what controls the injector pulse, but most vehicles either use the signal from the crankshaft position sensor or a cam position sensor. You should use a LED testlight, (NOT A BULB TESTLIGHT!!) and backprobe the injector terminals (with the other lead of the testlight to ground) while cranking the engine over. If the light flashes on one of the terminals, then you are getting injector pulse, and the fault lies elsewhere. If not, then you will need to replace whatver sensor is used to provide engine position signal on that model. Also, check the wiring to that sensor. Some vehicles have problems with the crankshaft pulley harmonic balancer failing and damaging either the body of the crank position sensor or its wiring.

Posted on Nov 02, 2008

dgjtex
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SOURCE: Heater wont work in my 1990 Chevy Truck

Several things can cause this (1) low coolant (2) bad coolant valve to heater core.(3) bad damper in duct.

Posted on Dec 27, 2008

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Help... I have a 92 350 chevy truck that will not start. I have replace the ECM, coil, ignition mod., the fuel pump relay and the fuel pump. When i turn th Ignition switch on th fuel pump doesnt come on....


you said you tried applying direct voltage to the pump? proceed to remove the fuel tank and check the harness inside for continuity, both wires going to the pump itself. If wires prove to be ok , then proceed to replace pump .

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Help... I have a 92 350 chevy truck that will not start. I have replace the ECM, coil, ignition mod., the fuel pump relay and the fuel pump. When i turn th Ignition switch on th fuel pump doesnt come on....


You said you jumped the wires for the pump? Was that at the pump relay?
If you have a voltmeter or test light, keep the jumper wire in place and check for voltage at the fuel tank connector. The pump wire will be gray. With relay out and jumpered there, you should have battery voltage at the fuel tank connector. The key doesn't even have to be on, cause the relay has voltage to it at all times. If you jumpered it right (terminals 87 and 30 on the relay), and no voltage at the tank connector, you have a broken fuel wire somewhere between the relay and the fuel tank.
If you do have voltage at the tank, but the pump still won't work, only two possibilities, a bad pump or the ground for the pump is lost. Check the pump ground first.

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Where is the fuel pump fuel located on a 1990 chevy geo tracker


old post. tracker day.
there IS NO dedicated fuel pump fuse. like 1991 to present
but uses the same fuse as ECU and SPARK
IG-COIL

http://www.fixkick.com/INJECTORS/89/89-90schem1.jpg

the orig book by suzuki (eek, GEOs) has an error
and is corrected only on this page.
in red.
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that relay will break the bank, so learn to tests first.
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Check the voltage with someone cranking the engine. The fuel pump relay is incorperated in the FI relay located under right center of dash. It is a metal relay usually bolted to the floor near the ecm. Double check all the fuses inside and out

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No spark issue can be from a number of causes. Most likely the crankshaft position sensor. It is sensitive to minor damages. check position of the teeth. If bent carefully straighten. Also can be the ECM (main computer) On cars with no fuel pressure check oil sending unit because a faulty one that tells no oil pressure will make computer cut out fuel pump operation.

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