Fuel Pump fuse problem
08-19-2005, 12:55 PM
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Fuel Pump fuse problem
Today I went to work on the shark because my tranny fluid was slowly leaking at the joint near the cooler at the front. I patched the leak yesterday, and today I wanted to top off the tranny fluid. I searched & found some great instructions posted by Randy V on the best way to perform this. So, I go to start my car to warm up the tranny, and it starts and dies right away. I crank again and no start. I heard a clicking, so I instinctively checked the fuse panel. Fuse #22 blown. I removed the rear cover and checked the connections at the fuel pump, which is brand new and replaced three months ago. All ok. I popped in a new 16A fuse, and pulled out the relay. I turned the key to on, and checked the voltage across pins 30-87 and got 12V...good. Then I pulled the ground strap off and pulled the fuse panel. All wires in the back looked clean and connected, just how I left them when I overhauled the fuse panel ala Sharkskin's method. I looked around the fuel tank and found nothing unusual. All wires looked intact. I reconnected the ground and jumpered pins 30 & 87 on the fuel pump relay. A small spark and fuse 22 is gone again. In the wiring diagrams it states that the wires for the fuel pump also go to a connector T1(k) which is listed as "near the fuel pump". Does anyone know the exact location of such connector? I iimagine that those wires are simply for the purpose of the second fuel pump, which my car doesn't have. In the '79 diagrams, it shows the two fuel pumps, but no connector T1(k). If I can't find it, I am thinking about disconnecting the fuel pump wires and removing the extra wires if the connect to nothing. It says the connector is a single pole, but there are two wires going to it?? Seems useless to me. I drove the car around for about 30 minutes on wednesday, and before that it ran fine since I replaced the fuel pump, which was causing a previous no run condition. Thursday it rained pretty hard, so probably some water got into the wires and fouled something up. Any thoughts? Thanks, Borys.
08-19-2005, 01:27 PM
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Originally Posted by John Veninger
I've had a brand new fuel pump fail right in the middle of a race 
But, yeah: if there's big chunks-o-stuff in the tank that are getting pulled through by the pumps it doesn't matter how new or old the pump is. A pea-sized chunk of varnish (or a piece of the in-tank pump if so equipped) will seize a new pump as quickly as an old pump.
There's always the run-the-pump-in-reverse-to-clear-it method.
08-19-2005, 09:48 PM
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What you guys are saying is that if the pump is seized it would blow the fuse? I dont have an in tank pump. If I remove the connectors from the pump and and then jumper the pins to "turn it on" it shouldn't blow the fuse if the pump is the problem right? I was going to pull of the connectors next and jumper the pins (30-870to check the voltage at the pump connection. Thanks guys.
08-19-2005, 10:00 PM
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Originally Posted by Airflite40
What you guys are saying is that if the pump is seized it would blow the fuse?
I dont have an in tank pump. If I remove the connectors from the pump and and then jumper the pins to "turn it on" it shouldn't blow the fuse if the pump is the problem right?
08-19-2005, 11:07 PM
#6
If the pump has ingested an object, reversing the connections could possibly dislodge it. Also, follow the ground wire (larger connector to the body and check ground point to make sure it is clean and tight.
Dennis
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08-20-2005, 02:21 AM
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If I am reading the diagram correctly, the ground for the fuel pump is behind the right (pass) rear wheel cover? Also, does anyone know the location of that connector T1(k)?? (below)
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08-20-2005, 09:50 AM
#8
Borys,
The ground is at the right rear and (IIRC) attached to the bumper frame near the lights. The T1K connections should be unused leads (positive and ground) that are are used on models with in tank pumps. You should find them wire tied near the intank strainer that feed the external fuel pump.
Dennis
The ground is at the right rear and (IIRC) attached to the bumper frame near the lights. The T1K connections should be unused leads (positive and ground) that are are used on models with in tank pumps. You should find them wire tied near the intank strainer that feed the external fuel pump.
Dennis
08-20-2005, 10:05 AM
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Since the filter is after the pump to protect the injectors, I was thinking about trying to squeeze a small filter in before the pump to catch anything coming in from the tank. Any issues with pressure restriction to the pump with adding a filter?
08-20-2005, 07:25 PM
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Originally Posted by BerNard94
borys, fuel pump fuse is 25A. the fuel pump is not the only consumer on that circuit.
08-20-2005, 07:41 PM
#11
You manual is correct since you don't have an intank pump. If the ground and additional connectors are alright, check for a short behind the fuse panel by unplugging the large T connector (below the fuse panel) then checking for a circuit to ground from the #87 post of the relay panel. If that is OK pull the positive (small connector) off the fuel pump then check wire 5 (red and green) on the large T connector for a circuit to ground. If both of those are OK, check both connectors on the pump (one at a time) for a circuit to the case of the pump. If either shows a circuit you've found your short.
Dennis
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