Question about 1990 Ford F150

1 Answer

Only one tank (rear) is working. Every time I

Only one tank (rear) is working. Every time I switch to the front tank it runs for a few min and cuts out. What is the problem? The main fuel pump was just replaced and works fine and there were no issues till the replacement.

Posted by on

  • kkris777 Jul 02, 2009

    The last thing I want to do is switch out the internal pump. How can I easily test the switching valve. On a 1988 F250 exactly where is it??


  • kkris777 Jul 02, 2009

    The last thing I want to do is switch out the internal pump. How can I easily test the switching valve. On a 1988 F250 exactly where is it??



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
  • 75,797 Answers

There is a low pressure pump in each tank, we call it the "pickup" pump, it is either bad or the tank selector switching valve on the frame rail is defective

Posted on Jul 02, 2009

  • yadayada
    yadayada Jul 02, 2009

    U will hear the valve as it switches with the key on and engine off, very easy to hear, they are very reliable for the most part, if the fuel pumps have over 100,000 on them they are very suspect, do u hear it run (humming noise) when the key is turned on without the eng running? it will run for about 3 seconds and then auto shut down unless the engine is started


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

Dual tank switching valve

sounds like you have a grounding problem

Mar 21, 2017 | 1996 Ford F350 Crew Cab

1 Answer

1989 Ford 150 4cly truck will run fine then starts cuting off and dies out . . no one can fix it. in shop now. shop owner pay labor can not fix. in shop 50 days

Hi, Check fuel pump that it is running properly. Sounds like an electrical problem with the pump. Good luck.

Oct 29, 2012 | 1996 Dodge Ram

1 Answer

1996 ford f150 cuts off

Look for rotten or broken vacuum lines around the throttle body and the EGR rail. Also, if you have a two tank system, wiggle the tank selector switch from front to rear several times and then try starting it again and see how it runs. If it seems to clear the problem, run for a few days and then replace it. This was my problem. A $12 part and it would also give erratic engine codes. It would run excellent after a hard time starting and cut right out for no reason. It has to be something simple! A smooth running engine does not just quit. Also check the fuel pump relays (tapping them or swapping them cleans the contact surfaces and also check the wiring underneath the modules for any green corrosion or exfoliation) and associated wiring harnesses for damage or moisture or greasyness. A flashlight and mirror is useful for this. I can not empasize enough to check all over for vacuum leaks. Loose twisty hosing signals leaks too. replace or cut shorter to make a new seal. Good luck!

Nov 16, 2011 | 1996 Ford F150 Regular Cab

1 Answer

I have a 95 ford f150m eddie bauer series, i always used the front tank, on long drive's i would switch, over, one day after use, i park it, next morn, it would not start, i switch over to the rear, no...

it may have a seperate pump for the seprate tanks im not sure. it acts to me like its running thaose few miles on fuel left in lines from the back tank. i would start by selcting the frount tank when you put it to bed one night, then in morning have some one turn the key while you listen for a fuel pump if i didnt hera one i would start there. if i heard one check for a seperate fuel filter for the frount tank then check for pluged lines between the two tanks. it has to be someting simple. good luck.

Mar 21, 2011 | 1995 Ford F150 Styleside Regular Cab

2 Answers

'96 f150,4.9 six,dual fuel tanks,replaced front fuel pump,not starting.could it be the fuel cut-off safety switch or fuel pump relay.need location of both,owners manual missing.does rear tank pump need to...

I have a 1996 f150 and I had the same problem. I finally found out that the rear fuel pump is the main pump, and if it goes out then the front pump will not work either. There is a groud that both pump share on the rear cross member. If you are not getting good connection with the ground the fuel pumps will not work. Also if you replace the rear pump and it still does not work then your problem could be the fuel tank selector switch, it acts as a relay if it goes out then neither pump will work.

Jun 11, 2010 | 1996 Ford F150 Regular Cab

1 Answer

My 90 ford f250 runs on front tank but wont pull fuel from rear

It Maybe The Fuel Tank Selector Valve On The Frame Rail That Switch From From Tank To The Rear

Jul 13, 2009 | 1986 Ford F 250

1 Answer

90 f150. when i switch to the rear fuel take the truck runs for

sounds like the diverter valve or the switch is defective

Apr 29, 2009 | 1990 Ford F150

1 Answer

Rear tank full and selected for use but draws from the front

hi your symptoms suggest that you have slight blockage either in fuel line or most likely at point where rear tank fuel line enters the switch over reason ? you say runs ok on rear tank at 55mph? but when demand for more fuel / speed above that pump /engine cannot deliver ? due to narrowing of fuel line (tuberculation) so check flow from r/tank and for any debri inside?

Nov 20, 2008 | 1989 Ford F 250

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

253 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

75797 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22114 Answers


Level 3 Expert

5495 Answers

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

Answer questions

Manuals & User Guides