Mechanics

MAJOR FUEL PUMP ISSUES PLEASE HELP

1991 Nissan Pathfinder • 100,000 miles

I have been having some major issues with my fuel pump.

When I bought the vehicle the guy told me he had to put a new fuel pump in the vehicle and gave me the receipt for the pump.

Shortly after I purchased the vehicle the fuel pump went out and when I went to look at the pump and found the fuel pump harness had a melted wire, so I then had to find another harness at a junk yard.

I then went and redeemed the warranty on the fuel pump the guy had put in the vehicle before I bought it (now thinking that was a bad idea as I should have tested the old pump in the new harness before redeeming the warranty on the pump because now I can't get a new one unless I pay for it) and put the new pump and harness into the vehicle.

It ran for about 2 months then one day slowly but surely started to die on me and later found that I had no fuel pressure and that my BRAND NEW FUEL PUMP had died, I ended up putting in an old fuel pump I got from the harness at the junk yard in and now the vehicle starts no problem.

Just to see what would happen I drove the vehicle around for a day going about 10 or 15 miles and had no problems then the next day I was driving home from work and I noticed my rpms where lower than normal at idle and after a couple more stops it started to drop so low in rpms (below 500) that it started to die it also smells heavily of gas when this happens.

As soon as I gave it gas it was fine and when I got home and checked my fuel pressure it was still at the right psi but it seems to me that once my engine warms up that's when it wants to die while idleing.

I have no idea whats going on and I can't figure out why I'm having such a bad time with the fuel pump.

If anyone has an idea on why this is happening I would very much appreciate any advice on fixing it as $160-$200 a fuel pump is not something I can afford to buy every couple of months and I like the vehicle and want it to run like it should.
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Scottscott07
June 26, 2012.



Scott: Make sure the fuel pressure regulator is working properly and not allowing too much pressure to build. Also, it could be doing the opposite, not enough pressure.


I believe you have an idling issue rather than a fuel pump problem at the moment. The fuel pump issue had made you paranoid.

The engine is idling too low and it possibly is due to dirty throttle body and AACV (IAC). Get them cleaned and retest.


KHLow2008
Jun 26, 2012.