Question about GMC S-15

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Can i bypass the fuel pump relay on my 1989gmc s15 and get my truck to start

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  • 372 Answers

If the relay is bad yes.

If the problem is not the relay it won't help.

If it is the factory relay it will have a schematic on it to tell you what wires to jumper for testing

Posted on Apr 14, 2015

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MrRodneyLong
  • 55 Answers

SOURCE: 1989 honda accord fuel pump or relay not working

I know that you want a simple answer but, have you done any troble shooting steps at the pump its self? when the relay is in does it pump at all? what is your lin pressure?

Posted on Jul 03, 2008

keemo68
  • 1263 Answers

SOURCE: 1985 Volvo 240 no fuel no spark

well first the fuel pump relay is bad, that is easily replaced. next you have no spark. the first thing you do is take the cap off the distributerand crank the engine. if it spins that tell syou thyat at least the tang or gear on the shaft of the distributor is ok and not broken. next thing is remove the #1 plug and use a 1/4 drive extension 6" long and turn the crank by hand until the #1 cylinder is top dead center(put the extension in the hole of head where the plug was and you should feel the top of the piston also make sure you can feel the top of the piston with half the extension this way you don't drop it in the cylinder with the piston at TDC(top dead center) the rotor of the distributor should be pointed at the #1 firing position. IF it does not that means your timing is off and you need to retime it by taking off timing cover and either replacing the belt/chain or gears. now if you do not have a distributor and you have a coil pack there could be only 2 things that won't give spark. either a bad coil or your altenater is bad(the battery is responsible for starting not running the vehicle like alot of people assume. the altenator energizes the coil which inturngives spark. hope this helps you please rate this thanks

Posted on Sep 07, 2008

keemo68
  • 1263 Answers

SOURCE: fuel pump or fuel pump relay on 1989 Chevy Suburban 1500 4x4

the relay and fuse are in the power distribution box under the hood. as far a by pass you still can use an aftermarket electric pump ,however the cost will be about the same as re3moving the old pump in the tank if that is the cause in the first place. if all you need is the relay replaced then i'm sure that the pump is still good. if the pump is bad then make sure if you by pass the in tank pump that the new under hood electric pump has enough pressure to give the needed gpm(gallons per minute) required for your system and that if wired into the current fuel circuit that you dissconnect the wire harness to your tank pump

Posted on Apr 26, 2009

fingaz22
  • 1068 Answers

SOURCE: Where is Fuel Relay for 2004 Dodge Ram 3500 Diesel Truck

it doesn't have a fuel pump relay it has a fuel pump control unit and it is located on the chassis back quarter drivers side near the tube cross member for chassis on top of chassis rail near bed mount. locate the rear springs front perch and it will be above that on top of rail.

hope this helps. good luck and please ask any question you have.

Posted on Oct 25, 2009

Testimonial: "Thanx for info..no wonder I couldn't find Relay! "

  • 1 Answer

SOURCE: RENAULT MEGANE 1.6 FUEL PUMP RELAY CLICKING

i was told i needed a new fuel pump relay for my renault megane but when i put in the new one it only worked for a few minutes. the only way i can get my car to work now is by inserting some wire into two points on the relay bos and bypassissing the cut off device.any suggestions?

Posted on Mar 31, 2010

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I have a v6 1985 gmc s15 sierra it turns over strong but wont crank


No, it cranks over strong but won't start an run is the right way to state that. Now then , did you check for spark , fuel pressure ? No Start Diagnostic Basics EricTheCarGuy

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How To bypass the Fuel Pump Relay


Don't bypass the fuel pump relay . power to the relay comes from the ignition switch on start cycle .when the engine is running the oil pressure switch takes over the circuit .so if you crash and the engine .stops so does the pump . If the fuel line brakes a bypassed pump will keep pumping spraying fuel and you could burn.

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Fuel pump relay, turning the ignition on runs the fuel pump for about two seconds to pressure the fuel rail to start, then the fuel pump relay takes over once engine is started, it relies on a signal from the ignition or ECU (to say keep running). Either the relay has gone down or the relay has lost the signal. Don't bypass the relay, it's a safety feature, to stop the fuel pump if a fuel line ruptures.

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I have a 90 s15 jimmy i have replaced the fuel pump and relay it will start and run for a few min then shuts down i can wait 10 min and it will start again and quit i can spray starter fluid in it and...


Did you replace the fuel filiter there is a big problem with the fuel pumps on these vehicles how long ago did you replace it and you repair the wireing problem to the pump

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Where is the fuel pump relay for a 1991 gmc jimmy?


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Relay - Fuel Pump 1991 GMC Truck S15 Jimmy 2WD 4.3L TBI 6cyl The Relay - Fuel Pump Under hood, driver side, upper firewall, mounted in relay block

Jul 02, 2009 | 1991 GMC S-15 Jimmy

1 Answer

The fuel pump has been changed, however it does not pump fuel. A by-pass swith was installed and it works. What makes this happen. Could it be the ignition switch causing the problem. When the by-pass...


Chances are the fuel pump relay has died, and the bypass switch is turning it on in the absence of the relay. Replace your fuel pump relay and you should be able to get rid of the bypass switch.

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1987 nissan pulsar


Question is, does fuel pump relay come in/ go out when ignition switched on? How do you know "no power source to fuel pump", was that because bypassing the relay didn't cause it to run? Or did you check for supply to the pump and find nothing doing?.
Sounds rather like a frozen pump to me... or a blown fuse??

May 28, 2008 | 1989 Nissan Pulsar

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