what will cause a fuel pump to not build up & shut off on a 1993 ranger.when i turn it over it has 38 lb.pressure


Asked by Nov 09, 2014 at 10:24 PM about the 1993 Ford Ranger XLT Extended Cab 4WD SB

Question type: Maintenance & Repair

i changed pump,filter & pressure regulator but pump still don't cut off with swith in on position

6 Answers


Your thinking of the old low pressure type pumps that had a built in regulator so the pressure would lift the needle off the seat inside the carb. The system your ranger has is a high pressure system, it provides a continuous supply of fuel to the fuel rail and pumps the unused fuel back into the tank as long as the engine is running, so it never builds pressure and shuts off. When you first turn the key on you should hear the pump run briefly then turn off. That builds the fuel pressure up quickly for the initial start.

1 of 1 people found this helpful.

Just found your previous post, as it won't run unless you spray starter fluid in the intake and you have enough fuel pressure to start, i would check for power and trigger signal to the injectors, they have to squirt fuel for the engine to run.


thats my problem.you turn the key on & the pump comes on but never shuts off.

2 of 2 people found this helpful.

Then think some one has jumpered the fuel pump to ignition voltage or possibly jumpered the fuel pump relay, but the engine should still fire and run even with the pump jumpered, as I stated it is a continuous flow system. Test the injectors electrical, you could have a short or a fried driver in the ECM.


itwill run if i shoot a little gas in throttle body.it idles pretty good but when i give it gas its like its starving


Does the fuel pressure jump up when you try to accelerate the engine? There could also be an exhaust restriction. Have you checked for codes?

Your Answer


Looking for a Used Ranger in your area?

CarGurus has 4,654 nationwide Ranger listings starting at $1,495.


Ford Ranger Experts

  • #1
  • #2
  • #3
    Bob Beaman
View All

Related Models For Sale

Used Ford F-150
2,492 Great Deals out of 220,121 listings starting at $1,222
Used Dodge Dakota
65 Great Deals out of 3,149 listings starting at $1,600
Used Chevrolet S-10
9 Great Deals out of 1,023 listings starting at $999
Used Jeep Wrangler
303 Great Deals out of 20,122 listings starting at $2,900
Used Dodge Ram 1500
324 Great Deals out of 9,607 listings starting at $800
Used GMC Sierra 1500
885 Great Deals out of 58,974 listings starting at $1,980
Used Ford Mustang
289 Great Deals out of 38,320 listings starting at $1,995

Used Cars For Sale

2011 Ford Ranger For Sale
25 Great Deals out of 683 listings starting at $3,988
2010 Ford Ranger For Sale
9 Great Deals out of 371 listings starting at $2,900
2009 Ford Ranger For Sale
10 Great Deals out of 258 listings starting at $3,500
2008 Ford Ranger For Sale
13 Great Deals out of 370 listings starting at $3,000
2007 Ford Ranger For Sale
11 Great Deals out of 271 listings starting at $2,750

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.