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I changed out my spark plugs... Spark plug wires... Distributer cap and rotor... Fuel pump and fuel filter and a new fuel pump relay and my fuel pump still will not work on my 1991 caprice.. Can someone help me?

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  • Cars & Trucks Master
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I guess you know the ignition system is not connected to the fuel pump circuit.
The pump relay gets power from the key switch and the computer grounds the relay to power the pump. You get power for 3 seconds when you first turn the key on. Then you have to have oil pressure to continue powering the pump.
Have you checked the relay to see if it is working ?

Posted on Jul 26, 2013

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Posted on Jan 02, 2017

  • 306 Answers

SOURCE: truck has no spark changed fuel pump fuel filter

Odds are it is the $20.00 ignition control module but that may be another fluke change out of parts. LOL

Posted on May 01, 2009

  • 34 Answers

SOURCE: 1997 chevy silverado 1500 350 vortech, new fule pump not working

before you drop tank again, check fuses & relay.then disconnect fuel line @ filter turn key to on position should hear fuel pump run and get gas stream out of line. if no flow from line new pump faulty be sure & remove negative battery cable first good luck.

Posted on Jun 20, 2009

  • 3 Answers

SOURCE: Car dies or loses power

My 1995 died after rain storms and high humidity,my mechanic changed the distribution cap, the wires and ignition and its find now 181,000 and still going strong.

Posted on Aug 06, 2009

SOURCE: no spark or fuel pressure

It like you have short circuit the system,it need to be check by a professional car electrician.

Posted on Feb 02, 2010

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SOURCE: I am having problems with my 1993 honda accord.

does engine start any way, let me know if it will not start

Posted on Aug 02, 2010

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1 Answer

MISFIRING AND I CAN'T FIGURE OUT WHY, DOES ANYONE HAVE AN ANSWER? NEW WIRES,NEW PLUGS,NEW CAP AND ROTOR AND CAP, NEW FUEL PUMP, NEW FUEL FILTER,


Hi Tom:
No make or model given so don't know type of ignition.
Would it be a big deal for you to do a compression test?
That might give a hint.

Jul 29, 2015 | Cars & Trucks

1 Answer

On a 1990 Nissan axxess it starts up then it shuts up and struggle to turn back on what could be the problem.


This could be anything from bad spark plugs, wires, rotor, and distributer. It could be fuel delivery, or bad gas. I would start with simple things, change the gas filter, the spark plugs, take a look at the distributer cap and rotor and the spark plug wires. If it has been sitting for a long time, pump the tank out and put fresh gas in.

Jan 08, 2015 | Nissan Cars & Trucks

2 Answers

I have a 1987 ford ranger the engine turns over but it wont start


Spark at plugs? Fuel filter? Pressure on injector delivery line? Pressure relief valve? You may be able to measure fuel pressure at the pressure relief valve location. and return line. If you have spark, I'd say it's a fuel supply problem

Dec 21, 2014 | Ford Cars & Trucks

1 Answer

I have a 1990 mitsubishi might max it wont run smooth unless you keep your foot on the gas and keep the rpms up a little bit and it wont drive cause it stalls everytime you try to move it. ive replaced the...


You've already eliminated the spark plug & wireset, distributor cap & rotor.
Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.

Components checked/replaced during a tune-up are:
air filter
motor oil
motor oil filter
breather filter
fuel filter(s)
fuel strainer
PCV valve
EGR valve
spark plugs
spark plug wires
ECM or distributor cap & rotor
cabin air filter
transmission oil filter
transmission oil
engine coolant
check all vacuum hoses and lines

Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:

Priority Action Part Type -- Cause
1 Inspect Battery -- Battery Discharged or Faulty.
2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned.
3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter.
5 Inspect Ignition Coil -- Faulty Ignition Coil.
6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter -- Starter Motor Faulty.
9 Inspect Fuel Pump -- Low Fuel Pressure.
10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch.
11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Drive -- Faulty Starter Drive.
15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat.
17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC.
18 Inspect Fuel Tank -- Fuel Tank Empty.
19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke.
20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.

Aug 17, 2011 | 1993 Mitsubishi Mighty Max

1 Answer

Replaced bad fuel pump, installed new relay and fuel filter, engine turns over but is not firing on..... positive the fuel pump is pumping gas and checked to see if gas was going thru fuel filter. Tried...


Hi, Ok you have confirmed that it's not a fuel problem. You need to check for spark. Pull the coil wire off of the coil(secondary lead-looks like a spark plug wire) Have some one crank it over and listen for a popping sound. IF yes, spark is at the coil, that means all ignition sensors are working. Next check for spark at ends of wires after cap. IF no replace cap and rotor. IF yes remove a couple spark plugs and check for fouling(wet, fuel etc...) IF yes replace or clean plugs and retest for starting. IF no spark is present at coil you need to scan computer and watch for rpm signal. IF no rpm signal, replace crankshaft sensor with OEM delco part. BIGGEST problem with these engines is Cap and Rotor burn out.

May 23, 2011 | 2002 Chevrolet Blazer

1 Answer

No spark or fuel pressure


It like you have short circuit the system,it need to be check by a professional car electrician.

Feb 01, 2010 | 1992 Honda Accord

4 Answers

CANT FIGURE IT OUT


Is the fuel pump running? Take the gas cap off and put your ear by the filler. Now have someone turn the key to the on position (not all the way to start). You should hear the fuel pump run for about 3 seconds. If you don't hear the pump run, the most likely culprit is the fuel pump itself. Second possibility is the fuel pump relay.

May 21, 2008 | 1989 Ford Bronco II

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