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The truck is acting like it is starving for gas although i have alrready replaced the in tank fuel pump.

The truck is efi and the only thing I can come up with is the fuse is blowing. if you have answers please help! oh and its a 1989 f150 lariat xlt 300 straight 6

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  • 14 Answers

Have you checked to make sure the fuel filter isn't clogged (in fact, check all the filters). Sometimes it's really that simple . . .

Posted on Feb 17, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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Thunder55
  • 318 Answers

SOURCE: My 1987 f250 efi straight 6 4 spd starts and then dies 90,000mi

Some years of the "F" series pickups had two fuel pumps,, one High Pressure and One Low Pressure.
It could be either one.

Posted on Jan 29, 2009

chiquititas
  • 1010 Answers

SOURCE: truck that wont start

Here is a link that might be relevant for your problem although its Mazda truck, but give it a shot:
http://www.fixya.com/support/t659042-truck_start

Posted on Jun 23, 2008

  • 1779 Answers

SOURCE: 1988 ford truck f-150 xlt lariat cant get current to fuel pump

Have you checked the 'inertia switch' which in the event of an accident shuts off the fuel supply to prevent a fire . It's usually located in the cab on pass. side. Some models have one reset button, some 2 which have to be pressed at the same time. If that's not it, here's how the power to the pump SHOULD work, you will have to follow the path to see where it stops. When you turn the key on it turns on the EEC power relay on, this relay then provides power to the PCM (power control module) and the control side of the fuel pump relay. Power for the fuel pump is supplied through a fuse link or high current fuse attached to the starter solenoid (battery side). From the fuse link or high current fuse current flows thru the fuel pump relay and inertia switch to the fuel pump. The fuel pump relay is controlled by the PCM. When the ignition switch is turned on the fuel pump will operate, if the switch is NOT turned to start position, the PCM will shut off the fuel pump off after 1 second. This is to avoid flooding the engine when it is not running, just key on. So check out to see if you have a fuse link or a high current fuse and if they are blown.

Posted on Apr 15, 2009

michael_grey
  • 365 Answers

SOURCE: 1989 f150 300 inline 6

I would check the stator(hall effect switch) in the distibutor.4f600f4.jpg

Posted on Jul 21, 2009

  • 1 Answer

SOURCE: 90' Ford F150 Lariat 4.9 inline 6 cyl w/ EFI and 2

The fuse for the fuel pump is pretty much the toggle switch between tanks, if that goes out, you will not have either tank.. IF you had an accident, there is a kill switch somewhere behind the dash on that truck that disables the fuel pump and must be reset.

Posted on Nov 05, 2009

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