Question about 1996 Lincoln Mark VIII

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I wasnt getting fuel.i changed the pump still no fuel, if i run a power wire direct the pump works but the factory power wires one is yellow it has power the orange one dosent what do i do now

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The orange may be for the sending unit. If the pump runs when you wire it direct, it could be the fuse or the relay.

Posted on May 11, 2010


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1 Answer

Car not getting fuel .

There is only one thing left. The wire connecting to the fuse box or the ground wire from the fuel pump. Try connecting a wire from the + side of the battery to the fuel pump directly. If that works, the feed wire is bad.

Jan 20, 2013 | Cars & Trucks

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No fuel

Check that the fuel pump is not jammed , eventually replace it, check also the fuel filter.

Jul 20, 2008 | 1991 Suzuki Sidekick

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Starter motor went out on 92 5.0 ho replaced it and new battery, now fuel pump does not work I get a 542 code checked fuel pump relay and inertia switch both good fuse good

  • Code 542 indicates one of the following conditions:

Engine Starts:

· Fuel Pump secondary circuit shorted to power

· Fuel pump relay contacts always closed

· Open in fuel pump monitor (FPM) circuit between ECU and connection to POWER TO PUMP circuit

· Heated Exhaust Gas Oxygen (HEGO) sensor shorted to power

· faulty ECU

Engine Does Not Start:

· Open inertia switch or inertia switch circuit

· Open in or between ECU and fuel pump (This includes open in fuel pump brushes/windings)

· faulty ground connection at fuel pump

The easiest way to check this circuit is to go to the fuel pump relay. If the relay clicks when the key is turned to the "RUN" position, then the inertia switch circuit is ok.

The Pink/Black wire starts from the fuel pump relay and goes two directions. One side goes back to the fuel pump. The other side is the fuel pump monitor circuit and goes to pin #8 at the ECU. This wire should only be hot for a second or two when the ignition is turned to the RUN position.

The fuel pump relay receives power on the Black/yellow wire. It comes from a fusible link at the power distribution center. This wire should be hot at all times.

If all the above is working as designed, them you probably have a bad fuel pump.

Feb 13, 2011 | 1992 Ford Thunderbird

1 Answer

Wasn't getting juice to fuel pump ran a wire to fuse box wire is heating up but it worked fine for about a year pulled pump found the short and replaced wire new wire is heating up also. could i need...

Afellow ranger owener Ihave an 85 that iv,e had for 23 years but it has a mechical pump but i also have the factory manaul that covers the electric pump. According to the wireing diagramstarting at the fuel pump relay and working backto the pumps there are two pumps in this systen one is in the tank and a high pressure inline pump mounted to the frame rail. OK 37 yellow powers the relay from ignition switch comes out of relay as 787 PK/BK -H goes to a switch called a inertia switch and says opens at impact so i would think it brakes the currciut in a crash it has connection on bolth sides and is 37 Ythen turns back to 787 PK/BK -H Then goes to the in line pump witch is grounded by 57 BK 787 splits and runs to in tank pump this wire 787 PK/BK -H between the two pumps is sopposed to be a 1000 OMHS resistor wire goes through the motor witch grounds 57 BK and 29 Y/W come from the sending unit in tank and feed fuel gage

Dec 04, 2010 | 1986 Ford Ranger 2WD

1 Answer

Car war hesitating and missfiring so i replaced the fuel pump because the code reader said lean fuel and i researched to see what could it be and it revealed it could bethe fuel pump or the mass air flow...

normally a fuse burns out because of a short in the wireing and/or the item the fuseis running is defective...(check o2 censors, spark plugs"plugs,wires", and the ignition coil...

Jul 20, 2010 | 2006 Chevrolet Cobalt

2 Answers

Its not getting fuel to the motor. i was drivin down the freeway and it sputtered like it was ou of gas when i know it wasnt


Power for the fuel pump is supplied by fuse #16 in the Power Distribution Center (PDC), goes through the Fuel Pump Relay and then to the Fuel Pump and the ground completes the circuit. Power for the Fuel Pump Relay coil is supplied by fuse #18 in the PDC and the Powertrain Control Module (PCM) supplies ground. It is a fairly simple circuit to check.
The first thing to do is check all the fuses, especially #16 and #18. If you have they are good then you will need to pull the fuel pump relay and check for power, with the key ON at the dark green/black wire and orange wire. The DG/BK wire is the power for the fuel pump and the OR wire is the power for the relay coil. If you have power there connect a jumper between the DG/BK wire and the dark green/white wire. You should hear the fuel pump running. If not there is a problem in the DG/WT wire from the relay to the pump.
Okay, lets assume that checks out fine, the next thing to do is replace the fuel pump relay and ground the dark blue wire. You should hear the fuel pump running. Okay? Good, now go to the PCM located on the firewall in the engine room. It has three large connectors, black, white and grey. There is a DB wire in cavity 19of the grey connector. Ground this wire and you should hear the fuel pump running. If it does then the wiring for the fuel pump circuit is all good and the PCM will need to be replaced. If it doesn't run, then you have a problem in the DB wire between the relay and the PCM.

Jul 14, 2010 | 1997 Jeep Grand Cherokee

1 Answer

Fuel Pump wiring

If I understand right, I would say the normal ground for the pump is bad.
"I am guessing the pump uses a ground source to start." well, just the normal ground like for any motor, you have the power wire (gray) to the pump, then the ground wire for pump, does it branch off near the tank and find a ground? Or does it go into the tank connector and then routed back somewhere through the wiring harness? Anyway, it has to go to ground somewhere. You have the wiring right it sounds,. just make a good ground source, or find the original ground and repair it.

Mar 14, 2017 | 1999 GMC Sierra

2 Answers

1988 subaru gl power to fuel pump, fuses and links are good. pump works fine with power probe, just not getting power to it..diagram shows black and yellow wire to pump. it is in fact a blue...

The blue wire changes to Blue/White. It gets power from the Fuel Pump Relay. Fuse number 11 is the power source. The relay is up under the dash panel, blue connector

Nov 04, 2009 | 1988 Subaru GL-10

1 Answer

Not getting power to the fuel pump, checked relays and fuses all good, replaced pump, ( 2 diffrent pumps) and checked what i beleve to be inerta switch it wasnt engaged yet i still have no pump cycling...

If you say its 2 different pumps and no joy it seems to be a power flow problem.

From the engine bay go to the relay and check to see if the power to pump (Red wire from memory) is getting 12v when set to run. If its not the red wire probe around to you find the one that changes between ignition on and off.

Now check to see if its getting 12v if its getting anything below that you have an issue along the wire to it. I had this same problem in mine and it turned out the wire at the relay had melted along the line and was supply less and less power to it gave up.

Hope this helps.

Oct 10, 2009 | 1991 Lincoln Town Car

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