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

10

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

90,495

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.

90,495

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.

10

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

1 out of 1 people think this is helpful.
90,495

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.

10

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

90,495

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

Add photo
Ranger

Looking for a Used Ranger in your area?

CarGurus has 6,023 nationwide Ranger listings starting at $1,299.

ZIP:

Search Ford Ranger Questions

Ford Ranger Experts

#1 tennisshoes
tennisshoes
Reputation 1,240
#2 Tracy Hooks
Tracy Hooks
Reputation 790
#3 Tom Demyan
Tom Demyan
Reputation 750
View All

Related Models For Sale

Used Ford F-150
2,238 Great Deals out of 208,514 listings starting at $1,499
Used Chevrolet S-10
12 Great Deals out of 1,359 listings starting at $1,595
Used Dodge Dakota
107 Great Deals out of 3,855 listings starting at $1,000
Used Dodge Ram 1500
439 Great Deals out of 11,285 listings starting at $1,000
Used GMC Sierra 1500
831 Great Deals out of 65,980 listings starting at $1,995
Used Jeep Wrangler
273 Great Deals out of 18,549 listings starting at $2,995
Used Ford Mustang
380 Great Deals out of 46,804 listings starting at $1,500
Used Mazda B-Series Pickup
187 listings starting at $2,495

Used Cars For Sale

2011 Ford Ranger For Sale
41 Great Deals out of 1,005 listings starting at $4,995
2010 Ford Ranger For Sale
21 Great Deals out of 429 listings starting at $3,499
2009 Ford Ranger For Sale
17 Great Deals out of 351 listings starting at $2,995
2008 Ford Ranger For Sale
21 Great Deals out of 445 listings starting at $3,450
2007 Ford Ranger For Sale
13 Great Deals out of 358 listings starting at $2,995