Fuel Pump Fuse..Where is it?

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Barry - 11 Nov 2007 00:12 GMT

My 1989 F-150 has no power to the fuel pump. A test light, and volt
meter both confirm this. I've replaced the fuel pump relay, and my
Haynes manual mentions a fuel pump fuse. Nothing in the fuse block has
anything to do with the fuel system. Any help is greatly appreciated.
Thanks in advance.
Barry

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CJB - 11 Nov 2007 02:29 GMT

> My 1989 F-150 has no power to the fuel pump. A test light, and volt meter
> both confirm this. I've replaced the fuel pump relay, and my Haynes manual
> mentions a fuel pump fuse. Nothing in the fuse block has anything to do
> with the fuel system. Any help is greatly appreciated.
> Thanks in advance.
> Barry

Very strong chance that the problem is with the inertia switch. I don't
know where it is on your truck, but it's a very common cause of your
symptom.

CJB

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Whitelightning - 11 Nov 2007 02:56 GMT

>> My 1989 F-150 has no power to the fuel pump. A test light, and volt meter
>> both confirm this. I've replaced the fuel pump relay, and my Haynes
[quoted text clipped - 8 lines]
>
> CJB

I believe its in the right side kick panel area. a white button poking up
above the top of it.

Whitelightning

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Barry - 11 Nov 2007 02:59 GMT

Thanks men for your answers.
However, I did test the inertia switch by disconnecting it,
and jumpering the connection, with no results. Is there a
better way to test the inertia switch?

>>>My 1989 F-150 has no power to the fuel pump. A test light, and volt meter
>>>both confirm this. I've replaced the fuel pump relay, and my Haynes
[quoted text clipped - 13 lines]
>
> Whitelightning

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aarcuda69062 - 11 Nov 2007 04:49 GMT

> Thanks men for your answers.
> However, I did test the inertia switch by disconnecting it,
> and jumpering the connection, with no results. Is there a
> better way to test the inertia switch?

Jumpering the inertia switch is as reliable as it gets.

The fuseing for the fuel pump is a fuse link.
The fuse link is blue, 20ga. and is located at the starter relay.
The fuse link is the 12 volt feed to the fuel pump relay on the
yellow wire.
Check the yellow wire at the fuel pump relay with a test light,
if no voltage, check the fuse link and associated wiring.
if voltage at yellow, jumper it to the brown wire and check for
voltage to the fuel pump.
Also, key on engine off, check for 5 volts at the coolant sensor
lt green/yellow wire, if no 5 volts, give the EEC relay a rap
with a screwdriver handle.

The EEC relay and fuel pump relay are easy to mistake for each
other, you didn't swap out the wrong relay by chance?

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Barry - 12 Nov 2007 00:46 GMT

Its fixed!
Although the fuel pump relay we bought was listed for our vehicle, it
was incorrect. We drove to a salvage yard, and found one in a 1987 F150
that matched our original. Got it home, and the engine fired right up.
Thanks for your help. That tip about jumping the yellow and brown wire
revealed the relay to be incorrect.

>>Thanks men for your answers.
>>However, I did test the inertia switch by disconnecting it,
[quoted text clipped - 17 lines]
> The EEC relay and fuel pump relay are easy to mistake for each
> other, you didn't swap out the wrong relay by chance?

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