'84 Fuel Pump - ? Ground Problem
Thread Starter
Cruising
Joined: Oct 2007
Posts: 14
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From: Grand Forks ND
'84 Fuel Pump - ? Ground Problem
Hi -
I have an '84 that has gone through three fuel pumps. The first one went bad shortly after I got the car and I didn't think much of it. I bought a replacement and within a couple of weeks it went bad also. I returned it for a replacement figuring I got a bad pump from the factory, but the new one went bad in relatively short order also, so I'm convinced it's something electrical with the car. I did check the voltages at the pump and they were ok (I did this last spring so I don't remember the numbers, but the car has sat in the garage since then as we were doing some other work on it).
My thought is that there may be a ground issue and my question is - has anyone else run into this? Is there an easy fix or at least someplace to start? I considered running a new ground from the battery back to the fuel pump, but was hoping for some input on whether this might work or if there is a better solution.
Thanks in advance,
Matt
I have an '84 that has gone through three fuel pumps. The first one went bad shortly after I got the car and I didn't think much of it. I bought a replacement and within a couple of weeks it went bad also. I returned it for a replacement figuring I got a bad pump from the factory, but the new one went bad in relatively short order also, so I'm convinced it's something electrical with the car. I did check the voltages at the pump and they were ok (I did this last spring so I don't remember the numbers, but the car has sat in the garage since then as we were doing some other work on it).
My thought is that there may be a ground issue and my question is - has anyone else run into this? Is there an easy fix or at least someplace to start? I considered running a new ground from the battery back to the fuel pump, but was hoping for some input on whether this might work or if there is a better solution.
Thanks in advance,
Matt
Instructor
Joined: Sep 2007
Posts: 134
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From: Charlottesville Virginia
I had an issue with my 86 when I replaced a fuel pump. the car would start but it would act like it wasn't getting a good flow of gas and made lot of noise. I thought it was a grounding issue. But I finally traced it to the pulsator on the fuel line above the pump. The pump kept sliding out. I don't know if the 84 has one. I removed it and put a piece of fuel line in its place and clamped it. It fixed my problem.
Instructor
Joined: Aug 2001
Posts: 110
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From: Wichita KS
you might want to think about using a fp from a later corvette 85 or so they have higher fp and with the crossfire regulator they work great.
another thing to check would be the fuel filter or some other blockage in the line
good luck
matt
another thing to check would be the fuel filter or some other blockage in the line
good luck
matt
Drifting
Joined: Aug 2004
Posts: 1,294
Likes: 295
From: Galveston & Belton Texas
fuel pump ground (blk) is common with just about all the rear lighting so if everything to the rear seems to work then would think ground wire (Pin R Dash Connector to rear of car) is just fine. Just make sure that fuel pump ground wire has continuity with either side mark lamp. If it doesn't then you found at least one thing to fix. Dash connector Pin E (pink) and Pin L (lt blue) are the other two wires to the fuel meter/pump.
May not have anything to do with your situation but I once thought I had a bad fuel pump. Worked sometimes and other times not. Replaced the fuel pump with some generic replacement from O'rielly and still same result. Checked my fuel pump relay and it was good but my 3-blade oil pressure sensor was leaking and this intermittently was causing a sporadic "oil pressure" signal going to my fuel pump relay. Just something to look at. Once I replaced my oil sender, my new generic pump has been working perfectly great. In fact, I bet the one I took out would have worked just fine too.
May not have anything to do with your situation but I once thought I had a bad fuel pump. Worked sometimes and other times not. Replaced the fuel pump with some generic replacement from O'rielly and still same result. Checked my fuel pump relay and it was good but my 3-blade oil pressure sensor was leaking and this intermittently was causing a sporadic "oil pressure" signal going to my fuel pump relay. Just something to look at. Once I replaced my oil sender, my new generic pump has been working perfectly great. In fact, I bet the one I took out would have worked just fine too.
