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Pages: 1

Fuel pump shutoff problem

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Posted by: katz_blk90se

Anyone out there ever have any issues with their automatic fuel pump shutoff switch? I cant get my 90 Mark VII to start and when I check
the auto shutoff switch, the red button is pressed completely down.
The only way to get the button back up is to unhook the switch
and use a little flat bladed screwdriver to pop it back up. There is
also something loose inside that rattles when I shake it. It this normal?
I have never messed with this switch before and would like some
feedback before I replace it. This is the switch that is located in the trunk
on the left hand side behind the metal panel right next to the air suspension switch.

Thanks folks!

Posted by: NYC LS8

I thought I had a problem with mine once, so I cut the wires from it and butt-connected them together. You can try that and see what happens.

Posted by: katz_blk90se

Quote:

Originally Posted by NYC LS8

I thought I had a problem with mine once, so I cut the wires from it and butt-connected them together. You can try that and see what happens.

Thanks for the idea. I am off tomorrow and will give it a shot. Will post the
results on here. Here is a shot of the front end. Hope to have folks on the road looking at the rear by the weekend!

Posted by: OldSchool1

Your inertia switch is a normally closed switch. The button is normally down.

If you disconnect the switch and then jumper the two wires together and the car runs fine, then the switch is bad and MUST be replaced. The reason for the switch is to shut off the fuel pump in case of an accident.

These switches normally do not go bad unless used excessively.

Posted by: 1bad4.6l

mine went bad in my 91 tc i rerouted it never had a problem after, unless the old lady hit the toggle with a grocery bag.

Posted by: katz_blk90se

Swapped out the inertia switch with no luck. Looks like the dadgum fuel pump. I cant hear that puppy start up when I turn the key. Will replace it
tomorrow and see what happens...

Posted by: OldSchool1

Quote:

Originally Posted by katz_blk90se

Swapped out the inertia switch with no luck. Looks like the dadgum fuel pump. I cant hear that puppy start up when I turn the key. Will replace it
tomorrow and see what happens...

I'm glad that you eliminated the possibility of the inertia switch.

Before dropping the tank, I would check the fuel pressure. 40-44 pounds should be normal.

Posted by: katz_blk90se

Just finished running at 105 MPH on I-75 in Tampa. The car is running like a
champ after the fuel pump replacement. You all saw a shot of the front of
the car, here is the rear which is what folks should be seeing again now
that I am back on the street.

Posted by: OldSchool1

Quote:

Originally Posted by OldSchool1

I'm glad that you eliminated the possibility of the inertia switch.

Before dropping the tank, I would check the fuel pressure. 40-44 pounds should be normal.

Quote:

Originally Posted by katz_blk90se

Just finished running at 105 MPH on I-75 in Tampa. The car is running like a
champ after the fuel pump replacement. You all saw a shot of the front of
the car, here is the rear which is what folks should be seeing again now
that I am back on the street.

OK.
So I'm slow

I'm glad that your ride is back on the road!
What pump did you go with?
Was there anything special/different about the replacement?
Are th Eagles going to win this weekend?

Posted by: katz_blk90se

Quote:

Originally Posted by OldSchool1

OK.
So I'm slow

I'm glad that your ride is back on the road!
What pump did you go with?
Was there anything special/different about the replacement?
Are th Eagles going to win this weekend?

Went with the Advance Auto 99 dollar special. Consisted
of the pump/hose only. I reused everything else after a good
cleaning. The pump and hose were an exact match.
The pump was made by a company called "Master"
whom I have never heard of, but the box had "NASCAR
Performance" on it, so I guess it is decent.

Hmmmm, the Eagles, well in my football pool only one
person out of 20 picked the Dolphins to win so I guess the odds
are with ya. I thought about picking Miami just because
of them starting John Beck, but McNabb, Westbrook and
company are simply better. So, bottom line, PHILLY wins
35 -17!

Posted by: OldSchool1

Quote:

Originally Posted by katz_blk90se

Went with the Advance Auto 99 dollar special.

Cool.
Now, everybody note today's date because 12 years from now, when someone says, "The AdvancedAutoPepZone pump is junk!" then you all can refence back 12 years and 120,000 miles that katz put on this pump and it's still kicking butt.

Quote:

Originally Posted by katz_blk90se

Consisted
of the pump/hose only. I reused everything else after a good
cleaning. The pump and hose were an exact match.
The pump was made by a company called "Master"
whom I have never heard of, but the box had "NASCAR
Performance" on it, so I guess it is decent.

Amazing.
Almost nobody supplies you with virtually ANY hardware anymore.

Quote:

Originally Posted by katz_blk90se

...
So, bottom line, PHILLY wins
35 -17!

Bartender!
Give this man a drink please!

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