Question about 1990 Ford F150

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1990 f150 2wd 4.9 truck runs decent then acts like it's running out of fuel. switch tanks and truck runs fine for a while but then act like it runs out of fuel. switch back to original tank and good to go. don't need to stay on either tank for any length of time. switch after a couple of seconds and the truck smooth's out. already replaced the tank switch. any ideas?? only code is 33

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  • Ty Johnson Feb 15, 2019

    I had a similar issue ended up being the control module or computer



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I think you need to replace the front fuel pump it has a bad check valve in it. Check with Ford there is a tech bulletin written for these and they have a modified part for repair. I hope this helps, Take care. If you have more questions for me use testimonial and it will show up in my email. Thanks

Posted on Feb 15, 2019


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Posted on Jan 02, 2017


SOURCE: !999 Ford Ranger

It could be the mass air flow sensor. Its mounted to the side of the air cleaner. Just unplug the electrical connection to bypass the unit. If this is the problem the vehicle should run smoothly.

Posted on Oct 08, 2008

  • 749 Answers

SOURCE: 1990 f250 fuel system

This is not a solution , just a clarification. Did you change the fuel filter and put it back on in the correct direction or is the fuel line beyond the pump producing gas?

Posted on Oct 29, 2008

  • 11896 Answers

SOURCE: 1990 Ford f250 Diesel dies at idle.

could be bad glow plugs or plug heaters, faulty wiring to the coil, vacuum leak.

Posted on Jan 29, 2009

  • 4 Answers

SOURCE: trucks runs on back tank, won't run on front tank

most likley the fuel pump is bad in front tank

Posted on Apr 09, 2009

  • 45 Answers

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

sounds like the diverter valve or the switch is defective

Posted on Apr 29, 2009

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