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WHAT DOES A FUEL RELAY DO AND WHAT FAULTS CAN IT HAVE

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  • Chevrolet Master
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The fuel pump relay controls the pump most relays have 4 pins 2 are the controlling circuits usually ignition feed and the ecm controlling the ground side when energized (grounded) the coil closes a set of contacts usually battery positive and the controlled item in this case the fuel pump. problems on the controlling side open circuit shorted circuit controlling side bad contacts stuck closed or open.

Posted on Apr 19, 2014

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Posted on Jan 02, 2017

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1992 acura integra it doesnt want to start but when it does it dies ten minuites later and wont restart replaced the fuel pump distributer main relay and fuel pump- relay and it still wont start now


It sounds like the fuel pump relay ,they have a long list of faults ,if you still have the old relay take the top off it and with a small soldering iorn dab it on all the solder joint,s and put a dab off fresh solder on them ,just be careful not to l et them run together.

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My Montero sport 2000 while driving shut down and it will not start turns over it has gas


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SUV stalls and dies when in use. had engine light code to replace MAF. did not work. continuing to stall and die.


remove battery pole,pull out & clean one by one all fuses & relay contacts change positions of relays, clean air intake with carburator cleaner,check for clogged catalysts check fuel relay or change it some faults are not vissible

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Fuse for fuel pump on 2001 pontiac sunfire


There are some logical steps need to be taken 1st. Verify if the engine has air, fuel and spark. Fuel can be checked with an inline gauge at the fuel rail. There could be several different things wrong. Bad ECM, fuel pump, injectors, fuel pressure regulator etc. Need to verify spark, this too may have several different problems. Bad ECM again, power/ground circuit faults, coil pack ect.

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Changed the fuel filter and the fuel pump, still only runs for about 10 minutes


REPLACE FUEL PUMP RELAY.CHECK WITH CODE SCANNER FOR ANY TROUBLE CODES.IF ALL IS GOOD YOU HAVE VACUUM LEAK.LEAKING PCV VALVE.YOU COULD HAVE BAD PLUGS AND WIRES.FAULTY COIL OR FAULTY IGNITION MODULE.BUT SCAN VECHICLE WITH CODE SCANNER.LOOK FOR CKP OR CMP SENSOR FAULTS.

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CHECK FUEL PUMP FUSE AND RELAY.IF BOTH GOOD LISTEN FOR FUEL PUMP RUNNING IN GAS TANK WHEN YOU TURN ON THE IGNITION SWITCH.YOU HEAR NO SOUND.SCAN VAN FIRST FOR PCM FAULTS SINCE IT CONTROLS FUEL PUMP IF PCM GOOD.FUEL PUMP IS BAD.IF FUEL PUMP RUNNING REPLACE FUEL FILTER.

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1 Answer

I have a 2001 GMC Sonoma 4.3L that stalled while driving. Will turn over but wont start. Have spark, new battery, and the back spark plugs are dry. No error codes. Has fuel to manifold.


SOUND LIKE FUEL PUMP BAD. CHECK FUEL PUMP RELAY AND FUSE.MAKE SURE YOUR ENGINE IS NOT OVERHEATING.SCAN IT FOR IDLE SPEED CONTROL AND ENGINE COOLANT TEMPERATURE SENSOR FAULTS.

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9-3 will not start


check for fuel flow find & diconect fuel suply inlet line to fuel rail turn engine over

Jun 29, 2009 | 2001 Saab 9-3

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Fuel pump


A quick way to check and ensure that the relay is the fault is too bridge the relay which will activate the pump continuously.

The relay is located in the engine bay and is in the fuse/relay plate box on the upper right (if looking at engine from front). You will then see 3 relays on the left hand side of the box and the fuel pump relay is the front one of those 3.

Remove the relay and you'll then see a 3x3 grid of pin inserts that look like "+". Now number these '+' like on a phone keypad and using a pin or any conducter small enough to fit into the inserts bridge the inserts 4 & 8.

E.g

+ + +
4 + + - Fuel pump relay
+ 8 +

This will cause the fuel pump to run on full time, determining the relay as being faulty. Let me know how it goes and il guide through the next step if unsuccessful. If so then you could be looking at possibly wiring faults or more! Best start with the cheapest option I think!

Hope this helps!

May 05, 2009 | 1994 BMW 3 Series

2 Answers

No spark or fuel in a 1991 explorer


Concerning the fuel issue, i would check these components listed below for faults and possible damage as well. any damage or apparent malfunctions in these specific devices will disrupt normal fuel flow in this vehicle. The list follows.

1. Inspect the Fuel Filter-- This filter may be clogged or dirty. replace if faulty.
2. Inspect the fuel pump relay-- This relay may be faulty and not functioning at this time. it will cut of the flow of fuel if so.
3. Inspect the Fuel Injector Pressure Regulator-- This may be a problem spot as well if it becomes unstable and unable to regulate the pressure.
4. Inspect the fuel pump-- This device actually pumps the fuel needed for operation. if its not working, it will disrupt the flow of fuel to the injection system as well.
5. Another problem spot will be the Engine Control Computer-- This device is vital to proper spark and fuel operation. if its malfunctioning, it will affect spark and fuel flow. check accordingly for faults. also know as the ECM/PCM.
6. Inspect the Fuel pump strainer--- This device could be clogged or dirty as well. replace if found to be dirty or clogged.

Concerning the Spark-- This issue can encompass many problem areas in the engine compartment. One common issue with a non spark issue would be the distributor cap or ignition coil. most newer vehicles will have the coil and older models will have the distributor cap design. I would check the distributor, if installed for a cracked cap or burned components as well. if your model has a coil ignition system, i would test its operational value as well. Also, check the Wireset as well.

Check the spark plug wires for worn or damage insulation. make sure they are connected to the plugs securely and tight.

Inspect the ignition switch for broken connections. this switch, if faulty, can affect proper ignition timing and spark as well. Your vehicle has a distributorless system and i will address the proper procedure that will allow proper testing results.

The distributorless ignition system used by 1991-94 2.3L and 4.0L, and all 1995-99 engines is referred to as the Electronic Ignition (EI) system. It eliminates the conventional distributor by utilizing multiple ignition coils instead. The EI system consists of the following components:

Crankshaft Position (CKP) sensor Ignition Control Module (ICM) (EEC-IV systems only) Ignition coil(s) The spark angle portion of the Powertrain Control Module (PCM) Related wiring


I recommend testing all EI system components for faults. if there is a fault an any of the EI system devices, it will disrupt the ignition system and it will cause a non spark issue that will result in a non start.

Please rate and god bless:)


May 04, 2009 | 1991 Ford Explorer

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