89 f-150 Isnt getting fuel, how do I know if it's fuel pump, filters or relay?

20

Asked by Jul 12, 2013 at 01:41 AM about the 1989 Ford F-150 XLT Standard Cab 4WD SB

Question type: Maintenance & Repair

My 89 F-150 died on me driving down interstate. It won't turn over, like it's not getting gas. Sounds like fuel pump is running even after key is off.  I know it is a fuel problem because I threw a gas soaked shop rag in under the air filter and it started right up. But is there an easy way to tell which it may be? I don't have a lot of fancy gadgets to test stuff, I know a little about vehicle repair and my husband knows nothing, so I am just trying to get ideas. And does anyone know how I can tell if my truck has the in-tank fuel pump without dropping the tank? These trucks have an external, but some have an in-tank pump as well. (I was told that it only has an internal if you have dual tanks with aplastic rear tank. But who knows.) Thanks for any input.

4 Answers

11,365

To the best of my knowledge, you have in tank pumps on these trucks, and if you have the dual tanks, you have a pump and sending unit in each one. The best way to check, quickly for fuel from the pump, is to pull the fuel line off the tank side of the fuel filter. Put a pail under the open end of the line, and have someone turn on the ignition, but not try to start it. The electric pump should start immediately, and the gas will come out of the line. If it does not, you have a bum pump or relays. To check for that, unplug the electrical lead to the pump/sending unit, and check for current with the ignition turned on. If you have current, then the pump is bad. If there is no current, then the relay is bad, and it should be found in the "Electrical Distribution Box" under the hood. Hope that helps.

15 people found this helpful.

For what it's worth, I found these, click on them to see

21 people found this helpful.

and

12 people found this helpful.
10

open filter box spray starting fluid if she fires it is clogged pump filter, or inline filter,faulty pump or faulty switch, or fuse under hood marking "Fuel" that should do it just one or replace it all. old truck my advice replace it all

Your Answer:

F-150

Looking for a Used F-150 in your area?

CarGurus has 225,878 nationwide F-150 listings starting at $999.

ZIP:

Ford F-150 Experts

  • #1
    OJ
    Reputation
    15,950
  • #2
    dandyoun
    Reputation
    5,750
  • #3
    tennisshoes
    Reputation
    5,710
View All

Related Models For Sale

Used GMC Sierra 1500
899 Great Deals out of 57,469 listings starting at $1,000
Used Ford Mustang
396 Great Deals out of 37,069 listings starting at $1,997
Used Ford Ranger
97 Great Deals out of 12,614 listings starting at $1,295
Used Ford F-250
3 Great Deals out of 344 listings starting at $3,995

Used Cars for Sale

2019 Ford F-150 For Sale
116,572 listings starting at $14,666
2018 Ford F-150 For Sale
295 Great Deals out of 41,276 listings starting at $16,990
2017 Ford F-150 For Sale
192 Great Deals out of 6,737 listings starting at $15,888
2016 Ford F-150 For Sale
455 Great Deals out of 12,576 listings starting at $8,995
2015 Ford F-150 For Sale
449 Great Deals out of 11,503 listings starting at $8,929

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.