Question about 1990 Ford Econoline

1 Answer

Wiring harness and hose plat for fuel system

Won' t switch tanks , gauges won't register , and won't pick up fuel

Posted by on

  • t_terreteta1 Mar 28, 2009

    i got same problem i got 2 daul tanks in front works but the back wont swicth it bk there



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Ford Master
  • 76,848 Answers

Replace the switch over valve on the frame rail driver's side, very common fauilure at my dealer on older trucks.

Posted on Feb 19, 2009


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

2003 Honda crv fuel gauge doesn't register full when filling up tank also twice while driving the gauge goes to empty and fuel light comes on

Could be the sending unit in the tank or the gauge on the dash.
A mechanic would test each component by disconnecting the harness at the tank.

Sep 25, 2015 | Honda Cars & Trucks

1 Answer

Fuel gauge registers full when ignition is switched on

Bad fuel sender unit or fuel sender wiring

Feb 03, 2013 | 1989 Jeep Wrangler

2 Answers

My fuel gage is reading full at all times and the radio will not come on is this a fuse issue or two different issues?

You definitely have two different issues as the fuel gauge and radio are on different circuits. The radio could be a blown fuse, which would require finding a short circuit. The fuel gauge could be as simple as a bad connection at the sending unit or a lost ground on the fuel tank. Disconnect the fuel gauge at the tank and with a twelve volt test light well grounded probe the harness terminals with the key on (engine off). The fuel gauge should move when the sending unit wire is probed, and the test light should light dimly. Other terminals are a ground for the sending unit, a ground for the fuel pump, and power for the fuel pump. If the gauge moves when the sending unit wire is probed the problem is either the sending unit or a bad harness connection. If the gauge doesn't move during the probe there is a wiring problem (open circuit) or a bad dash gauge. Hope this helps.

Jul 02, 2011 | 1998 Ford Windstar

3 Answers

Gas guage doesnt work

It sounds like a problem with the fuel gauge sender unit in the fuel tank which has worn out and gone open circuit and needs replacing. Access to the unit is usually through a removable plate in the floor in the rear of the vehicle. Disconnect the wiring connector and any hoses and then remove the securing screws. Replacement is done by reversing procedure.

Sep 16, 2010 | 1986 Lincoln Town Car

1 Answer

How to fix fuel pump

The fuel pump is in the tank. You'll have to jack the car up in the air and remove the straps that hold the tank up under the truck. Use a floor jack with a block of wood to lower it down slowly. While lowering it, watch for any wiring and hoses. When the tank is low enough, disconnect the wiring harness and slide the tank out from under the truck. Inspect the wiring harness that plugs into the top of the tank and look to see if the plug is melted. If it is, replace it. You can get the harness from the dealer or NAPA. With the tank out, unscrew the lock ring using a brass punch and small hammer. When the ring is off, simply lift up on the fuel pump assembly and installation is the reverse of removal. When you buy a fuel pump for the car, it'll be what they call a fuel pump module. It'll have the fuel pump and the sending unit for the gauge.

Apr 15, 2010 | 2000 Chevrolet Blazer

3 Answers

Replaced Fuel Sending unit on 1986 Chevy Truck

Check the ground wire at the wiring harness at the fuel tank. If it has a good connection then check the power wires to the tank. You may have a bad pigtail going to the tank. A replacement harness is available at NAPA.

Mar 28, 2010 | 1986 Chevrolet C1500

2 Answers

5.7L engine has fuel pick up issue running out of gas with indicator stating 1/4 tank left. replaced sending unit and fuel pump.. any suggestions

Most likely it's not a pick up issue since the fuel sending unit is right to the bottom of the tank. It's going to be and electrical or the float in the sending unit is bent and is giving a fault's reading of 1/4 of tank when the tank is actually empty. It's common for the float to the sending unit to get knocked out of alignment if the unit is knocked around to much when installed in the gas tank and or wire harness has not been replace from the sending unit to the frame of the car which is only around $15.00. Fill the gas tank a few time to the top may realign the float and give you a more accurate reading. Good luck and hope this helps.

Oct 27, 2009 | 1996 Buick Roadmaster

3 Answers


well its either the wire between the tank and guage in dash or it is the gauge in the dash

Aug 15, 2009 | 2001 Hyundai Accent

1 Answer

Fuel gauge does not work

It sound's like you have a graound problem with the wire harness from the fuel tank. Check the connection from the tanks to the fram. Good luck.

Apr 06, 2009 | 1987 Ford F 350

1 Answer

Fuel gauge registers empty after fill up

It sounds to me like you have a short in your wiring harness at you fuel tank. there is a plug on top of your fuel tank that controls you fuel pump and your sending unit that tells you how much fuel is in the tank. This plug can be a real p.i.a to get to on some vehicles, you may have to take the vehicle to a shop to fix it, if you are not mechanically inclined.

Mar 03, 2009 | 2003 Ford Explorer

Not finding what you are looking for?
1990 Ford Econoline Logo

Related Topics:

86 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

76848 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers


Level 3 Expert

5546 Answers

Are you a Ford Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides