Question about 1990 Ford F150

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I have an electric fuel pump, runs continuously when the key is in the on position; the engine cranks but doesnt start. I replaced 2 fuel pump relays; one fuel presuure regulator, There's no presuure coming up to the pressure regulator. when I take the vacuum line off the top of the regulator and put a piece of vacuum line in its place and draw/**** on the hose; the fuel pump cuts right off and then the trucl starts....what is the problem here...thanks

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

tbirdfan1
  • 3051 Answers

SOURCE: vacuum hose

if you get ahold of kragen they can help you with this

Posted on Aug 12, 2008

stormbrewin
  • 426 Answers

SOURCE: I have a 1998 gt

A couple of extra checks are turn the car over and try to start while some one squeezes the fuel return line,At the rail,with tool that doesnt damage fuel line.It eliminates fuel bypass through the fuel rail.No need to undo anything.Have someone confirm you have power while Cranking at the fuel pump end.It eliminates power supply issue.If these two test work out ok then the pump is looking very much like the culprit

Posted on Oct 18, 2008

mrgreenz
  • 962 Answers

SOURCE: No pressure in the fuel line when checked at the strader valve

You need to replace the fuel pump.

Posted on Jan 20, 2009

csmock132
  • 4669 Answers

SOURCE: 66 mustang engine running out of fuel

Do you have any of you fuel lines close to the exhaust? (vapor lock)

Posted on Mar 24, 2009

  • 136 Answers

SOURCE: Ranger fuel problem

There is a fuel cutoff switch on the passengerside floorboard, towards the right kick pannel, there will be a little red button on top of it, check to see if that is tripped, also when you turn the key to the on position listen to see if you hear the fuel pump prime up, just a short buzzing noise from the underside of the cab, if you dont hear it, that is a good indicator that your fuel pump maybe bad, i would also check the pressure at the fuel rail, chrome or black colored bar located near the fuel injectors.

Posted on May 05, 2009

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1 Answer

Just replaced the fuel pump in my 03 Toyota Matrix, car still doesn't want to turn over. What else could be the problem?


Explain doesn't want to turn over ? If the engine cranks when key is turned to the start position . You have a cranks but won't start an run condition . When you say it won't turn over , we as automotive technicians think the engine won't do anything when the key is turned to the start position. We don't just replace parts with out doing testing on the electrical circuit for the fuel pump , an hook up a fuel pressure gauge to test fuel pressure . It has to have spark , fuel an compression for the engine to start an run . Also the anti-theft system can't have any problems . Is there a security light lit on the Dash ? Fuel Pump Relay TESTING and REPLACEMENT

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1999 Ford Explorer Sport Starting Issue


It sounds like the pump is failing. That or sometimes not getting electricity. To check which it is, you could use a voltmeter or test light at the gas tank's electrical plug in. You need to check for power on the fuel pump wire when the engine is being cranked for starting. Do this when turning the key to on does not cause the pump to turn on for 2 seconds as it should. The fuel pump has power for those 2 seconds when key is turned to on, and again has power when the engine is cranked. You might miss the two second signal, so check for power when car won't start-when pump won't turn on-and with the engine cranking. If you have a signal then and still no pump coming on, then you must have a failing pump.
But if you have NO power to fuel pump wire with engine cranking, then it is a problem elsewhere-probably the pump relay (try a new relay if you haven't already). That relay is signaled by the engine computer when key is turned to on or when engine cranks . so you could do some testing at the relay if needed.

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I check all relay and don't receive direct electricity to the fuel pump and no start the car


You will never have direct electricity to fuel pump only when running then once you shut off ignition that shuts engine off fuel pump to automatically shuts off.I would change the fuel pump sit in car turn key Th start position do not crank engine if you do not hear a grrr,,,grunt sound i would say fuel pump not functioning therefore fuel pump malfunction replace.

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A couple of ideas-- you may have already considered. Is this an older car? If so, then some old cars get moisture in them on the electrical parts like say on the wiring harness or wiring. Another cause could be the battery is a bit weak. Go to Advance Auto or Autozone and get the battery tested. Then they getting the started tested. I hope this helps you! God bless!

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My 1995 grand jeep cherokee won't start but It turns over an a battery jump didn't work. I believe I'ts an electical problem, maybe related to the alarm because the starter, engine and battery seem fine..?...


Alarms usually won't allow the engine to crank. If it is the alarm, arming then disarming it usually gets them to start. However, you probably aren't that lucky. Probably the most common problem for Cherokees with ignition issues is a crank sensor or a fuel pump. Listen to hear if the fuel pump runs when you turn the key to the run position (it will only run for 2 seconds, so have someone else turn the key while you listen at the gas filler neck)

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1 Answer

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