Hidden Fuel Pump
Thread Starter
Instructor
Joined: Nov 2004
Posts: 211
Likes: 1
From: Calgary Alberta
Hidden Fuel Filter
I read there are two fuel filters on the 1987 model. I know of one under the passenger seat. Where is the other one?
Last edited by fast.asleep; Jun 30, 2006 at 11:59 AM.
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
there is a filter on the fuel return.
The fuel sending unit is accessable from the fuel door. Simply remove the fuel door, remove the cap, remove the big rubber thing, and you will see a bunch of bolts and hoses... and you are there!
before you remove the hoses, relieve the pressure on the lines... there is a harness at the fuel pump, disconnect and start the car. That will cause the engine to burn off whatever is in the line.
oh, no smoking when doing this task...
The fuel sending unit is accessable from the fuel door. Simply remove the fuel door, remove the cap, remove the big rubber thing, and you will see a bunch of bolts and hoses... and you are there!
before you remove the hoses, relieve the pressure on the lines... there is a harness at the fuel pump, disconnect and start the car. That will cause the engine to burn off whatever is in the line.
oh, no smoking when doing this task...
Le Mans Master
Joined: Jan 2003
Posts: 5,858
Likes: 7
From: Santa Maria CA
Originally Posted by fast.asleep
let me guess: the only way to get to it is to drop the tank?
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Le Mans Master
Joined: Feb 2006
Posts: 8,753
Likes: 9
From: Louisiana
There is one fuel filter on a 87, to my knowledge, as described. There is a strainer on the bottom of the fuel pump that "I guess" you could call a filter. The fuel pump is accessed by pulling it out of the tank from the top, as described. It is one of the easier things to do on a C4.
Thread Starter
Instructor
Joined: Nov 2004
Posts: 211
Likes: 1
From: Calgary Alberta
Originally Posted by bogus
I was thinking the same thing...
I'll replace the fuel filter, cap/rotor & plugs this weekend and see if things improve. If not I'll try wires and Fuel Pressure Regulator. Other than that I'm at a total loss...
Le Mans Master
Joined: Feb 2006
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From: Louisiana
Originally Posted by fast.asleep
If the sock/filter is at the top of the tank that doesn't really account for the stumbling I'm experiencing. (It only does it when the engine is hot. -and only when accelerating from a stop. If I punch it when I'm rolling, everything seems fine)
I'll replace the fuel filter, cap/rotor & plugs this weekend and see if things improve. If not I'll try wires and Fuel Pressure Regulator. Other than that I'm at a total loss...
I'll replace the fuel filter, cap/rotor & plugs this weekend and see if things improve. If not I'll try wires and Fuel Pressure Regulator. Other than that I'm at a total loss...
Thread Starter
Instructor
Joined: Nov 2004
Posts: 211
Likes: 1
From: Calgary Alberta
it's a 1987.
This isn't a new problem by any means, it just hasn't gotten worse until recently. I've lived the last few years by the same motto actually
I've been thinking that I would finally hook up my nitrous kit this summer and if I do I better get all fuel issue's fixed.
This isn't a new problem by any means, it just hasn't gotten worse until recently. I've lived the last few years by the same motto actually
I've been thinking that I would finally hook up my nitrous kit this summer and if I do I better get all fuel issue's fixed.
Drifting
Joined: Apr 1999
Posts: 1,261
Likes: 6
From: Middletown New Jersey
There is a definitely a filter on the fuel return line on an 87. Mine was replaced about a month ago and I watched my mechanic do it. It was in all likelihood the original filter. When we opened it up, it didn't look very dirty and frankly I could have gotten by without changing it.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by fast.asleep
If the sock/filter is at the top of the tank that doesn't really account for the stumbling I'm experiencing. (It only does it when the engine is hot. -and only when accelerating from a stop. If I punch it when I'm rolling, everything seems fine)
I'll replace the fuel filter,
I'll replace the fuel filter,
RACE ON!!!
Thread Starter
Instructor
Joined: Nov 2004
Posts: 211
Likes: 1
From: Calgary Alberta
Originally Posted by CFI-EFI
The sock is not at the top of the tank. Reread the posts. However, you are correct in that the sock is unaffected by engine temp. Same as the main fuel filter. It sounds as though you could benefit from a FSM.
RACE ON!!!
RACE ON!!!
thanks for the advice but it would be a lot easier if someone knowledgeable said "the second filter is beside the..." or "your looking at the wrong thing, I experienced the same symptoms and it was..."
Last edited by fast.asleep; Jun 30, 2006 at 12:00 PM.
Safety Car
Joined: Apr 2001
Posts: 3,525
Likes: 2
From: Houston TX
I can tell you that there is a return line filter on the '87. Unfortunately, my factory lines (and the factory filters) departed the car many years ago.
I think you may be chasing the return line filter for no reason. The highest flow requirements for the return filter is when the car is at idle and the engine is returning most of the fuel. When accellerating, less fuel is returned to the tank, thus the load is less on the return filter.
Aaron
I think you may be chasing the return line filter for no reason. The highest flow requirements for the return filter is when the car is at idle and the engine is returning most of the fuel. When accellerating, less fuel is returned to the tank, thus the load is less on the return filter.
Aaron
Le Mans Master
Joined: Jun 2006
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From: One day you're a Comet...the next day you're dust... Arkansas
When they replaced the fuel pump on my '89 they also replaced the "strainer" GM part #14765 for $10.32. I guess that's what you are talking about. They also replaced the "filter" GM part # 25171792 for $17.50. That's the one under the hood. That makes 2 filters I guess!
Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
Originally Posted by fast.asleep
Hmm. I've been nothing but good to this car. If the sock/filter is at the top of the tank that doesn't really account for the stumbling I'm experiencing. (It only does it when the engine is hot. -and only when accelerating from a stop. If I punch it when I'm rolling, everything seems fine)
I'll replace the fuel filter, cap/rotor & plugs this weekend and see if things improve. If not I'll try wires and Fuel Pressure Regulator. Other than that I'm at a total loss...
I'll replace the fuel filter, cap/rotor & plugs this weekend and see if things improve. If not I'll try wires and Fuel Pressure Regulator. Other than that I'm at a total loss...