'88 camaro w/305 TBI - fuel pump runs all the time!
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Joined: Jul 2000
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From: CA, USA
'88 camaro w/305 TBI - fuel pump runs all the time!
Help! I have this '88 camaro with a 305 TBI. My fuel pump runs all the time (or at least until the battery is dead!) Sometimes it shuts off when it is cool out side which makes me think that the switch is somehow hooked into the engine temp? I have to disconnect my battery now every time I go anywhere. I had a mechanic look at it, and he said that he would have to rewire the whole engine compartment to get it fixed right, so when I told him to do that, he replaced an oil temp switch and said it was fixed (its not...) and now he won't even look at my car again... So, what can I check to get this thing to quit running all the time!?!?!
-----------------------------------------
Bone stock '88 camaro base model w/t-tops
Everything works, even a/c! Can't wait to
modify!!! 100K orig. miles, 5K on new engine.
[This message has been edited by TimCalif (edited July 23, 2000).]
-----------------------------------------
Bone stock '88 camaro base model w/t-tops
Everything works, even a/c! Can't wait to
modify!!! 100K orig. miles, 5K on new engine.
[This message has been edited by TimCalif (edited July 23, 2000).]
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Tim,
First things first...
FUEL PUMP PROBLEM
The two main possibilities are a stuck fuel pump relay or stuck auxilliary oil pressure switch.
1. The stuck relay can be diagnosed by unplugging it from the harness while the fuel pump is running with the engine off. If the pump shuts off when the relay is removed, the relay is likely internally shorted.
2. If the pump continues to run with the relay removed, you may have a failed oil pressure switch. There are two oil pressure switches, and one is used for the dash instrument or warning light. It should have a single tan wire coonected to it with no other wires.
The oil pressure switch in question should have both an orange and a tan/white wire connected to it. On your '88, the switch should be on the rear ledge of the block near and left of the distributor (toward the driver's side). It could also be near the oil filter mounting, but this is generally where the sending unit for the dash gauge/light is found. Disconnect the electrical connector from the switch. If the pump stops now, the switch has probably failed.
3. If the pump continues to run with both the relay and oil pressure switch disconnected, you may have a rare case of a short in the wiring harness or a completely fried I/O section in the ECM, which would probably prevent the car from running in the first place. If you determine it is not either the relay or switch, post back and we'll go from there.
OTHER PROBLEMS
If I were you I'd find a different mechanic. This one obviously has no intention of staying in business or he would have a better understanding of automotive systems. Heck, this is 15-year old technology and he/she doesn't have a clue. What does that tell you? I can probably walk you through the repair without ever having seen your car, and I'm just some moron surfing the web. What's up with that?
Later,
Vader
------------------
"Some Body...Someone"
First things first...
FUEL PUMP PROBLEM
The two main possibilities are a stuck fuel pump relay or stuck auxilliary oil pressure switch.
1. The stuck relay can be diagnosed by unplugging it from the harness while the fuel pump is running with the engine off. If the pump shuts off when the relay is removed, the relay is likely internally shorted.
2. If the pump continues to run with the relay removed, you may have a failed oil pressure switch. There are two oil pressure switches, and one is used for the dash instrument or warning light. It should have a single tan wire coonected to it with no other wires.
The oil pressure switch in question should have both an orange and a tan/white wire connected to it. On your '88, the switch should be on the rear ledge of the block near and left of the distributor (toward the driver's side). It could also be near the oil filter mounting, but this is generally where the sending unit for the dash gauge/light is found. Disconnect the electrical connector from the switch. If the pump stops now, the switch has probably failed.
3. If the pump continues to run with both the relay and oil pressure switch disconnected, you may have a rare case of a short in the wiring harness or a completely fried I/O section in the ECM, which would probably prevent the car from running in the first place. If you determine it is not either the relay or switch, post back and we'll go from there.
OTHER PROBLEMS
If I were you I'd find a different mechanic. This one obviously has no intention of staying in business or he would have a better understanding of automotive systems. Heck, this is 15-year old technology and he/she doesn't have a clue. What does that tell you? I can probably walk you through the repair without ever having seen your car, and I'm just some moron surfing the web. What's up with that?
Later,
Vader
------------------
"Some Body...Someone"
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