Pump Relay
06-05-2006, 12:12 PM
#3
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Join Date: Jul 2005
Location: Southaven Mississippi
Posts: 2,053
The pump won't turn on with iggnition. It will if we hot wire it with a toggle switch.
http://i48.photobucket.com/albums/f2...060506_002.jpg
http://i48.photobucket.com/albums/f2...060506_001.jpg
http://i48.photobucket.com/albums/f2...060506_002.jpg
http://i48.photobucket.com/albums/f2...060506_001.jpg
Last edited by FubarI33t; 06-05-2006 at 12:15 PM.
06-06-2006, 08:11 AM
#5
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Join Date: Jan 2006
Location: NY, NY
Posts: 49
Originally Posted by naviathan
The fuel pump switch is in the AFM. It doesn't turn on until the engine is turned over and the sucktion pulls the AFM flap open.
Are you sure??? Every time I start the car I hear the pump activate as soon as I start to turn the key. The sound comes from the rear of the car.
06-06-2006, 10:25 AM
#6
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Join Date: Mar 2005
Location: Boulder, CO
Posts: 474
When you crank the car to start an EFI S30, the relays and logic that normally control sending power to the pump are bypassed. When you let off the key from "Start" to just plain old "On", the logic comes back into play. The fuel pump relay is in that box naviathan mentioned. It doesn't close unless your alternator is actually producing a charge. I found this out the hard way once testing the pump first, then the relay, and then the next piece upstream in the schematic was the alternator. Mine was dead.
Though I haven't looked at the schematic in awhile, I do remember there were more pieces to the overall logic circuit powering the fuel pump, and I wouldn't be surprised if naviathan's right about the AFM being one piece of the puzzle. If you don't already have a schematic for the car, you'll definitely want to get one. It's pretty easy to work on with that diagram, and just about impossible without it.
good luck,
Dave
Though I haven't looked at the schematic in awhile, I do remember there were more pieces to the overall logic circuit powering the fuel pump, and I wouldn't be surprised if naviathan's right about the AFM being one piece of the puzzle. If you don't already have a schematic for the car, you'll definitely want to get one. It's pretty easy to work on with that diagram, and just about impossible without it.
good luck,
Dave
06-06-2006, 10:50 AM
#8
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Join Date: Mar 2005
Location: Boulder, CO
Posts: 474
I wonder where it is on the '76s? On my 78's it's always been on the passenger side (all lefthand drive cars), mounted on the fender well, just behind the wheel, just in front of the battery and just in front of the inspection lid for the battery. The fusible links are mounted to the box, too, and two major wire harness plugs are clipped to it.
Really weird for them to have moved it, but there must have been some reason...
Dave
Really weird for them to have moved it, but there must have been some reason...
Dave
06-06-2006, 11:58 AM
#11
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Join Date: Apr 2005
Location: Temecula, CA
Posts: 5,485
But has the car started on its own without the toggle switch??? Was this car picked up from a junkyard? If so then there's a good chance that the relay was picked out of it which would explain why you can't find it 
06-23-2006, 05:54 AM
#13
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Posts: n/a
Originally Posted by naviathan
The fuel pump switch is in the AFM. It doesn't turn on until the engine is turned over and the sucktion pulls the AFM flap open.
I removed the gas tank inlet hose that goes to the fuel pump and plugged it with a wooden dowel to stop the gas flow. I removed the front half of the fuel pump (Four screws). I noticed that the Screen was pretty clogged so I cleaned it with break cleaner and figured this will fix it. Well I still cant get it to start. So I pulled the outlet hose from the fuel filter and there is no fuel comming out. I don't know at this point if this was my problem all along or wheather I hosed something up when I put the front half of the fuel pump back on (The fuel pump has "four" barrel type tumblers in there with a geneva type gear spinning them around). Next I guess I will pull the outlet hose off the fuel pump to see if fuel makes it out. I'm thinking maybe a bad fuel regulator? Any other ideas?.. PS: Sorry for hijacking this thread.
06-26-2006, 09:12 AM
#14
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Join Date: Mar 2006
Location: florida
Posts: 271
I normally use a razor knife to cut the silicone on the air flow meter cover and check usually find the switch contacts to either be dirty or the springiness has weakened over time. Usually just takes a slight tweak with some needle nose pliers to get it proper.
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