Question about 1990 Ford F150

1 Answer

IF I DON'T USE ONE OF MY DUAL TANKS DO I NEED TO CUT IT OFF SOMEWAY

I HAVE A 1990 FORD F150 XLT LARIAT THAT I NEVER USE THE BACK TANK. I PUT SOME GAS IN IT WHEN I BOUGHT IT, BECAUSE MY UNCLE WHO SOLD IT TO ME DIDN;T REALLY KNOW IF THEY WE'RE ON THE SAME LINE AND EQUALLED OUT EACH OTHER OR NOT. I KNOW THERE'S A SWITCH FOR EACH ONE, BUT ON THE REAR TANK WHEN SWITCHED TO IT MAKE A SLIGHT HUMMING SOUND AND SHOWS IT PAST EMPTY ON GAUGE. THEY'RE SHOULD BE SOME GAS IN THERE BECAUSE I NEVER USED IT. SHOULD I JUST NOT WORRY ABOUT THE REAR TANK OR DO I NEED TO SHUT OFF ANY ELECTRICAL CONNECTIONS AND GAS LINE FROM IT.

Posted by on

  • roundbaby Jan 25, 2013

    I BELIEVE THAT WHAT I'LL DO--JUST LEAVE THE TANK IN THE TRUCK FOR THE EXTRA WEIGHT FOR TRACTION. HOW IS THE BEST WAY TO GET OLD GAS OUT OF REAR TANK?? I HAVN'T REALLY TRIED RUNNING IT DOWN THE ROAD WITH THE REAR TANK SWITCH ON YET BECAUSE THE FUEL GAUGE LOOKS REAL EMPTY AND MAY CLOG MY NEW FUEL FILTER I PUT IN A FEW MONTHS BACK. I WILL ALSO CHECK ON THE VALVE SOUND BETWEEN TANKS WITH A FRIEND. I KNOW BEFORE MY TIME OF OWNING THIS VEHICLE THEY HAD A COUPLE OF RECALLS ON GAS TANK TROUBLES. ONE TAN K IS PLENTY FOR FARMING AND DEER HUNTING AROUND CLOSE BY ANYHOW. BUT I WOULD LIKE TO KNOW HOW TO GET GAS OUT OF REAR TANK OR IS IT ALREADY GOT BACK INTO FRONT TANK AS A GRAVITY BALANCE EQUALIZER??--THANKS FOR ANY SUGGESTIONS--P.S. I HAVE A PINHOLE LEAK ALREADY IN MY FRONT TANK AND I'M GOING TO GET A MECHANIC I KNOW GOOD TO DO SOME OF THE TROUBLESHOTING WHEN HE TAKES IT OFF TO TAKE IT AND GET IT BRAZED OR SOLDERED AT THE RADIATOR SHOP.

  • roundbaby Apr 10, 2014

    I PUT IN A NEW TANK IN FRONT SIDE AND THE MECHANIC SAID THE FUEL PUMP ON THE BACK TANK WAS PROBABLY BAD AND SAID JUST LEAVE IT WOULD BE FINE--JUST LET ANYONE THAT BORROWED IT TO USE FRONT ONE ONLY

×

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that hasĀ over 10 points.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 9 Answers

I had same problem with a 90 f250. I unplugged the rear pump. An straight wired the switch. Gas gos bad to fast for me to use 2 tanks. An I filled it w water and antifreeze after cutting the line for extra weight. And Put a locking cap on
far as cleaning the tank. I always drop tha tank, pull the pump off, and clean with a rag and new gas.
Use a tester an make shire u have power to Gage part of pump connectn. No power its a fuse or ground issue. If u have power, bad sending unit.

Posted on Apr 27, 2017

  • Rogee
    Rogee Apr 27, 2017

    I had same problem with a 90 f250. I unplugged the rear pump. An straight wired the switch. Gas gos bad to fast for me to use 2 tanks. An I filled it w water and antifreeze after cutting the line for extra weight. And Put a locking cap on

    far as cleaning the tank. I always drop the tank, pull the pump off, and clean with a rag and new gas.

    Use a tester an make shire u have power to Gage part of pump connection. No power its a fuse or ground issue. If u have power, bad sending unit.

    im thanking theirs a fuel filter under cab on drivers side on line.

×

6 Suggested Answers

6ya6ya
  • 2 Answers

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

Hi,
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.
goodluck!

Posted on Jan 02, 2017

junit80
  • 81 Answers

SOURCE: Dual tanks on 1990 Ford F150

It should not cause no problems but instead of removing the tank leave it in the truck take out all the fuel in the tank and jus discontinue use of it. This will save you alot of time and trouble and i also suggest that if anyone besides you drives this vehicle then i would put a locking gas cap on it so it cant be accessed at anytime except by you.

Posted on Jun 23, 2009

  • 1857 Answers

SOURCE: 1987 fuel level guage issue

thats funny, my 87 F250 does the same thing. At 80 bucks a sender unit I have learned to live with it even tho this is what I do for a living.

The reason fuel gauges fail is because of sulfur in fuels.

Do a search on sulfur and fuel sender units failures and you will find your complaint is the same as the masses.

Posted on Jan 30, 2010

ftw1952
  • 10319 Answers

SOURCE: 1987 fuel level guage issue

the gas is regulated from the switching valve you control off the dash. Check the valve to hear it switch
have a friend help you do this. it will be located under the truck between the two tanks. You may have a faultly valve or switch rattling inside changing the tanks setting also while driving which will be hard to tell

Posted on Jan 31, 2010

  • 975 Answers

SOURCE: 1989 Ford F150 Lariat Dual tanks...rear tank is

Thet don't have a switching valve,the switch just turns on one pump or the other.
Ford dealer has a fix ,a short piece of line with a one way valve,just snaps on to both lines .simple install,just buy the part,they will know what you are talking about at the parts counter,

Posted on Nov 19, 2010

ZJLimited
  • 17970 Answers

SOURCE: I have a 1990 Ford

Sound like your fuel tank selector valve is bad.it's located on the frame rail between the tanks and the filter.

Also, keep in mind that the rear in tank pump is bad. The dual function reservoir is mechanical. The pressure from the in tank pump switches the mechanical valves; the dual function reservoir serves two purposes:
1. Mechanical Selector valve for the tanks.
2. Holds extra fuel in the reservoir so if the gas tank is low on fuel and you go around a turn and the low pressure pump can't pump any fuel, the high pressure pump can still draw fuel from the reservoir.

Read this thread which explains how to test the in tank pumps: ford-trucks/88-5-0-no-start-fuel.

Keep us updated.

Posted on Feb 28, 2011

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

Ford truck


Do you have 2 gas tanks?

Jun 21, 2017 | Ford F-150 Cars & Trucks

1 Answer

1988 ford xlt lariat 4x4 need to see how to route my fuel lines ,dual tanks


The original gas tank on a 1998 F-250 Lariat has a capacity of 30 gallons. Because there is no mention of dual fuel tank capacity available, the 2nd fuel tank was likely added after purchase. You would need to know the capacity of the fuel tank when it was installed. ----------------------------------------------------------------------------------------
Lexia-3

Feb 23, 2013 | Ford Cars & Trucks

1 Answer

I have a 4.9L with dual tanks run off rear tank but will not run off front tank


Well, each tank has an assist pump insidfe it to supply the main hi-pressure pump on the left frame rail(usually) of your truck.Probably the assist pump in the tank that6 doesn't work has gone bad or started pulling air. don-ohio

Oct 12, 2011 | 1990 Ford F150

1 Answer

1991 Ford F150 xlt Lariat 5.0 engine Fuel pump


Had a problem like this before and it was the computer..But you could faintly smell something like burnt wires..The computer should be down by the kick panel on the driverside..See if you smell anything on that side

Sep 08, 2011 | 1991 Ford F150

2 Answers

1990 f150 xlt lariat 4x4 how do i delete my aux fuel tank. can i just plug the lines


Drain aux tank, remove/bypass switchover valve and run hose from main tank to line from switch valve forward.

Feb 26, 2011 | 1990 Ford F150

1 Answer

Dual tanks on 1990 Ford F150


It should not cause no problems but instead of removing the tank leave it in the truck take out all the fuel in the tank and jus discontinue use of it. This will save you alot of time and trouble and i also suggest that if anyone besides you drives this vehicle then i would put a locking gas cap on it so it cant be accessed at anytime except by you.

Jun 23, 2009 | 1990 Ford F150

1 Answer

Truck that wont start


Here is a link that might be relevant for your problem although its Mazda truck, but give it a shot:
http://www.fixya.com/support/t659042-truck_start

Jun 22, 2008 | 1988 Ford F 150

Not finding what you are looking for?
1990 Ford F150 Logo

Related Topics:

35 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts

yadayada
yadayada

Level 3 Expert

75066 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

fordexpert

Level 3 Expert

5470 Answers

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

Answer questions

Manuals & User Guides

Loading...