Question about 1986 Ford Econoline

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Fuel pump wiring for a 1986 rv

I replaced the fuel pump and the  tank in my 1986 Honey rv. The one problem . The wiring harness is different. 4 prong and bigger than the old one. 3 prong. Im guessing it will still work. Any ideas? I think I would need a 4 prong clip with a jumper kit..

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Take that new pump out and install the correct one. Why would you install something that is not an exact match to what you removed??

Posted on Aug 03, 2010


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Have a 90 Buick LeSabre that seems to kill fuel pumps every year for the last 4 years. It has been replaced each time at differing dealers and with new wiring harnesses. What could cause this?

How full do you keep your fuel tank ? If you repeatedly let the fuel level low ,this will cause premature failure ! Need's to stay around 1/2 tank or fuller , keeps fuel pump lubricated . So if you run your vehicle with a 1/4 tank or less all the time , this will cause fuel pump problems .Could have a resistance problem in the electrical circuit ! Does the connector at the pump look burnt when changed ?

Nov 22, 2016 | 1990 Buick LeSabre

1 Answer

Can't find fuel filter 1985 honey rv

TRACE the Fuel Line from the FUEL TANK to the ENGINE... GO SLOW and if there is a Fuel Filter, you will find it. If there is no Fuel Filter, then it is either part of the Carburator Screen or there is none

Apr 10, 2013 | 1984 Chevrolet K1500

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My motorhome 1986 chevy honey wont start fuel pump has no power

is it class "a" or class "c"motorhome----was the unit in a accident--check inertia switch

Nov 08, 2012 | Cars & Trucks

1 Answer

Feul pump has 3 prong what to do to change to 4 prong on my ford truck

I would think you were given the wrong fuel pump

If it was the correct pump ,you would have update
instructions that would guide you & also answer your

Oct 11, 2012 | 1991 Ford F150

1 Answer

I have 1986 Alfa Spider that won't start. Car has been sitting for a year. I replaced battery, fuel tank, fuel sender unit, both fuel pumps. I seems that the in tank pumps is not getting any po

Could be the main or fuel run relay located in the compartment under the luggage rack, passenger side, main relay also, fuse for the fuel relay 8amp. Electronic Control Unit is also located there.

Could be electrical, Hook up a timing light, three leads: Power, Ground, and one that goes around the wire to #1 cyl. Turn the engine over and see if there's firing. Note: u can check all 4 spark plugs this way.

Fuse lead goes to pin 30 of the fuel relay, u can jump 30 across to 57 and check for the pumps running, if not, change-I suggest both relays, main and fuel run relays. Both pumps get their 12v DC from the fuel run relay, both should be running when you switch ignition switch to on, then a tachymetric signal is fed from the coil to the relay to keep it running.

Jun 10, 2012 | 1986 Alfa Romeo Spider

1 Answer

I have a 1995 Ford F-150 with a 300 six, it has a full ffront tank and runs like it's running out of gas, I switch it to the rear tank, it runs fine.How do I fix it?

You probably have a bad fuel pump in the front tank. There are other possibilities as well. I have replaced tank switches for this reason also. You need to check for power and ground at the front tank when the switch is in the front tank position and the ignition switch is turned on.

At the wiring connector that goes up to the tank, (on the frame rail next to the tank) the power wire is the RED wire and the ground wire is the ORANGE wire. (The other wires are for your fuel gauge.)

The fuel pump relay will supply voltage to the RED wire for only about 2 or 3 seconds (to prime the fuel rail) when the ignition switch is turned to the ON position, so you will need a helper to check this.

If there is no power, then you should suspect the switch. However, check for power at the switch to verify that it is the switch and not a broken wire between the switch and the tank connector.

If power and ground are both present at the tank connector, replace the front fuel pump.

May 25, 2012 | 1986 Ford F 250

1 Answer

Im working on a 1986 toyota pickup 2.4l efi non turbo 4x4 i replaced the head gasket and i have a black wire coming from the intake wiring harness that has no plug on it .if i touch this wire to a hot wire...

Sounds like this wire should operate the electric fuel pump through the fuel pump relay.The fuel pump relay should start the fuel pump to maintain fuel supply to the common fuel rail and any surplus fuel will be bleed back to tank by pressure control.The injector opening sequence is contolled by computer once the engine is properly timed.
If you say the engine runs for a few seconds it would indicate fuel pump or relay is not getting power to operate or fuel pump is not delivering enough pressure to feed the injectors

Apr 29, 2011 | 1986 Toyota Pickup 4WD

2 Answers

Need to replace fuel pump, what are the steps

this is for a slightly newer year Buick regal, should be similar to what you need to do unless the car was completely overhauled in design in 2 or 3 years. Good luck!...

Generally the pump is located in the gas tank. Drain the tank, remove the straps holding it up, on the top of the tank you will see the pump wiring harness. Make sure the battery is disconnected! I think the harness and pump come out as one unit. When you replace it, you will need a new harness most likely. Have you checked the pump relay and filter? I have found over the years that the pump is fine, but the relay seems to go out alot.

The fuel pump is located in the fuel tank. To change the pump you need to open the hatch between the rear sets. Move the carpet out of the way. A access panel is their, remove it.

Next you will see the fuel pump module top. Remove the 2 electrical connections and the 3 hoses. On my I had to squish the little clear part down at the hose end to remove the 2 bigger hose. The middle hose was just a matter of fighting with it back.

I would grap a volt meter and make sure that you have 12 volts on the GRAY wire on the 4 pin connector for 2 seconds when you turn the ignition on before you proceed.

Next remove the metal ring . You do this by taking a pry bar and pry the ring inward. The pump might be stuck down a bit, pry up on the pump hose connectors and lift the pump out.
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Feb 03, 2011 | 1995 Buick Regal

1 Answer

My 1986 ford econline RV has fuel problems it starts and run's but acts like fuel pump I replaced the fuel pump in the tank and the fuel filter. It acted up before and I let it sit and it ran fine for...

take a look at the two relays on the top of fender sheild, these go bad alot,one is for the ecm and the other for the fuelpump,start there and also you may want to check to see what is not happening like spark or fuel

Jun 09, 2010 | 1986 Ford Econoline

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