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1987 eurocoach Need to know where fuel pump relay between pump and ignition is located. Wires run along with house wiring and are blocked by other components making it nearly impossible to trace. Suggestions?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 130 Answers

SOURCE: 1987 Volkswagen Golf - fuel pump relay

make sure you are getting the voltage (V) to the relay. Sure, you can easily bypass this aspect of the relay by shorting the contacts [enables V to relay] but that is entirely different V for the load rather than the V for the coil [which provides EMF, closes relay, makes contact, laaaa].

Evidently, you are getting V to the load [pump turns on once bypassed].

You aren't getting V to the coil side of the relay. Go back and recheck the wiring as well as the pump fuse. Take it out and do a continuity test [out of circuit].


Posted on Oct 15, 2008

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stormbrewin
  • 426 Answers

SOURCE: 1996 mazda mx6 ls cranks but won't start

you may need to run a wire from a keyed ignition source that has power while cranking and running to the fuel pump relay and bypass the pcm to test wether it will run, if it runs put a more permanent wire in place.Not too sure what tests youve done but it seems that fuel is what your focusing on so a quick test is too spray engine start up the intake tube to see if the engine trys to run if it does it eliminates a lot of other potential reasons for a no start condition.Also try squeezing the fuel return line to see if the added pressure will try to make engine run.Could be time to replace fuel pump etc anyway let me know how it goes good luck with it

Posted on Dec 12, 2008

  • 137 Answers

SOURCE: 1990 Acura Legend, location of main relay for fuel pump

looked it up online, looks like its in the underhood fuse box but couldn't get a good diagram that shows which relay number it is. the website i use is sort of dependent on the manufacturer, apparently acura did not feel like sharing that info. hope that helps

Posted on Jun 17, 2009

B-Roosky
  • 59 Answers

SOURCE: i am not getting power to my fuel pump

on a lot of ford products there is a switch that goes from the fuel pump to the inside of one of the bedsides.
what this is, is a shock switch that turns the fuel pump off if it absorbs a hit.
its a really dumb safety feature but its effective.
there is a red button on it that u have to press to make it active again.
sometimes they just trip for no reason.

Posted on Jan 11, 2010

  • 4 Answers

SOURCE: need to know location of fuel pump relay

The pump is in the tank. Before you consider dropping the tank. Lift the carpet in the back seat above the tank. The older MPVs had a trap door which would access the pump with out dropping the tank. It is definitely worth a look. I changed mine in half an hour.

Posted on May 14, 2010

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I have a 1987 chrysler conquest tsi and fuel pump only runs when key is on start not on run but pump fuel lines not hook only power wires to pump is this how it works?


What does it do with the lines hooked up ? Most fuel injected vehicles need an RPM signal to let the computer know the engine is running to let power continue to the pump .

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The fuel pump relay should be near the driver side fender or the battery along with other relays. It should have a dark green and yellow wire that goes to the inertia switch, a red wire that goes to the EEC relay, and two other wires that may be light blue and orange.
The wire that powers the pump goes to the inertia switch then to the pump.

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The Feol pump/circuit opening relay is located inside the cab on a relay block either behind the glove bosx or the right kick panel, I'll see if I can locate a location diagram and post it in a follow up. In the meantime locate the diagnostic check connector under the hood,it's located near the right fender on a fuse block, open the cover and put a jumper wire between the terminals FP and B+, turn the key on and let me know if this makes the fuel pump run.

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They are all the same part number replacement relays so you can swap them around to see if one is bad
The fuel pump relay will not work the fuel pump intitally for the oil pressure sensor has a 3rd wire running to the fuel pump. When you set the key to the ON position the oil sensors 3rd wires circuit will send 12 volts to the fuel pump to prime the fuel up the the injectors. You can hear it running for 5 seconds with the ignition key set to the ON position. DO NOT START the engine when testing for the sound of the fuel pump/ If no sound of the pump is heard, replace the oil sensor first

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Stupid question but did you look at the inertia swich on the firewall? If it gets tripped it shuts the fuel pump off and will not get gas.

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My 1994 suburban engine stops. No fuel, no MIL light.


I checked all of the fuseable links and they were all good. Next I decided to check all the power wires to the ECM and also the grounds from a wiring diagram because the Mil is controlled by the ecm and the bulb was good. The ecm is located behind the glove box. Bingo, the orange wire was only reading 3-5 volts at the ECM, but 12.5 volts after the fuseable link at the underhood fuse block (passenger side firewall). I ran a temp wire directly from after the fuseable link to the orange wire at the ecm and the ecm turned back on and the Mil or "check engine soon" light came on too. The truck started up and has never run smoother.

Note that at first the truck just stalled out and I could restart it right away with no error codes. Eventually the stalling became more frequent with longer reset times required. Once it threw a "code 54" and I thought it was fuel related as each time the gas stopped and I could still start the truck with gas poured into the TB. Ignition ok. My fuel pump turned on and ran if I tested it. I even checked the pressure regulator and the fuel filter to no avail.The orange wire that powers up the ecm is technically part or the fuel pump relay circuit as it also feeds the fuel pump relay 12.5 volts all the time. The thin orange wire from the fuse block is joined to two other thin orange wires in the large group of wires that heads to the ecm along the firewall behind the engine. I had to dig it out of the many wires to find it and remove a lot of tape. It is amazing to me that this one little orange wire could cause so much grief and be so hard to track down. I could not have afforded to take this problem to the Dealer.

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relay is under dash on driver side behind cruise control box. You tube has a demonstration on there for 92 accord.

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