Question about 1989 Ford F 150

1 Answer

1989 ford f-150 start but stalls out

Well here is the problem i truck will only run for about 2 mins then cut off its throwing code 87 for primary fuel pump circuit. Well i replace the fuel regulator, fuel filter, fuel select valve, FPR, main relay, check the inertia switch which is fine, i can hear fuel pumps working new wires new dizzy cap. im really stumped on whats wrong with it i hooked a fuel pressure tester too it and when i turn the key to the on pos. not starting it. It goes up to 43psi then goes back down to 40 psi then when i crank the engine it stays at 40 then slowly drops back down untill it cuts off, but when i turn the key back on to the on pos. it goes back up to forty. Now if i take the vaccum line off the regulator and start the engine its still runs the same and will cut off but the fuel pressure stays at 40 psi but will run and cut off the same im really stumped any help would be great any questions i havent answered please ask thanks.

Posted by brandon woolard on


1 Answer

Todd Arndt

  • 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
  • 2,044 Answers

Injector require 40 PSI on a Ford. Your Fuel Pump is BAD

Posted on Apr 08, 2013

  • 5 more comments 
  • brandon woolard Apr 08, 2013

    it stays at 40 psi if i take the vaccum line off the fuel pressure regulator only drops if i connect it back but its a dual gas tank so which fuel pump

  • Todd Arndt
    Todd Arndt Apr 08, 2013

    That is strange...

  • brandon woolard Apr 08, 2013

    it is ive been leaning to a bad fuel pump but ive seen that people replaced the tps and map sensor and it worked for them it seems like everything on this truck can break and cause the same problem

  • brandon woolard Apr 09, 2013

    ok so today i replaced the tps sensor it had 5 volts on the red wire which is gud .2 on the black which is the signal wire which its suppose to be .9 to 1.5volts and the green wire was suppose to be 11 to 12 volts but it only read .83 so im guess the ground for the tps is bad which the ecm does the ground so is that bad

  • Todd Arndt
    Todd Arndt Apr 09, 2013

    You don't need me... Did you test it with the Key ON or OFF ? But you are right.. It does get it signal from the ECU.. Here is the Problem.. You need to determine if 12v Power is suppose to be present and at what times is it NOT? For example, If there is no Input from the Crankshaft Sensor in 2 seconds, does the 12v power go away?

  • brandon woolard Apr 09, 2013

    well i have all data so i have the drection for the most part and it doesnt go away all the voltages stay the same and yes the key was on

  • brandon woolard Apr 09, 2013

    o and the 12v is suppose to be present at all times



2 Related Answers


  • 1 Answer

SOURCE: have ford f 150 302

i got a 6 cylinder ford truck when i drive it with the first tank it loose power. then i push the second tank and it runs normal .

Posted on Feb 12, 2010


Joseph Hoffmann

  • 1755 Answers

SOURCE: I have 87 ford ranger

Hi, I believe you have a leaking injector(s). Check and/or replace. Good luck.

Posted on Jun 17, 2011

Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer


Have you figured out if you are lacking fuel or spark when it fails to start back up ? Lack of fuel could be a pump relay, lack of spark could be the ignition module or the EEC relay.

Feb 24, 2014 | 1989 Ford F 150

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

Starts fine runs good most of the time but sometimes surges when you are going down the road

Im having same problem try this youll throw a code though remove your mass air flow sensor and try it if it runs good you need to clean it or reman or new one

Aug 25, 2012 | 1989 Ford F 150

1 Answer

1989 ford f 150 stalls out after running for 10 to 15 min

Disconnect the IAC and set the idle to idle on its own.The reason I say this is the timing procedure deals with disconnecting the IAC to set timing,retest the fuel pressure.

Mar 24, 2012 | 1989 Ford F 150

1 Answer

1992 Ford f-150 stalling. Happens after cold

pull the trouble code stored in the computer. That's your starting point ALWAYS

Mar 04, 2018 | Ford F-150 Cars & Trucks

1 Answer

87 F150 sputters and stalls after driving about 20 to 30 min.

Dual tanks sounds like one of them is letting air into the line. Had the same problem and when one tank was empty it would let air in to the line making the truck stall out and not start. Had to keep at least 1/2 tank in the one. Might want to change out the tank switch over.

Jul 01, 2009 | 1987 Ford F 150

1 Answer

87 Ford F250 turns over but wont start

Fuel cut off switch or inertia swith on passenger side kicker panel, it might have got accidently kicked while getting out.

Feb 02, 2009 | 1987 Ford F 250

Not finding what you are looking for?
Cars & Trucks Logo

258 people viewed this question

Ask a Question

Usually answered in minutes!

Top Ford Experts


Level 3 Expert

85239 Answers

Thomas Perkins
Thomas Perkins

Level 3 Expert

14852 Answers


Level 3 Expert

4372 Answers

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

Answer questions

Manuals & User Guides