Need FI 302 Help
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Laughing Gas
Joined: Feb 2004
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From: FLA
Need FI 302 Help
I have a Jeep with a transplanted 302 out of a 91 Mustang. The electric fuel pump is in the tank and the tank and pump are brand new. Here's the problem. After it sets over night, when I start it up it wants to chug, chug, chug. It lopes really bad. Now if I turn the key off and on about four times and let the pump build up each time it fires and runs well. Any have any idea why I have to do the 4 cycles and how I might fix it? Someone said my fuel lines were too big. My thought on that is, I don't think so. It seems leak back and loose pressure. I can start it up after it has set for a few hours with no problems. It seems to take 10-12 hours to leak back. Thanks for any input.
New User
Joined: Jun 2004
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From: Cedar Rapids, Iowa
My first Question is, it a automatic or manual? (Automatic) You might try to do a fuel pressure test, Pressure should be about 30 to 45 Psi when the key is in the "ON" position.(Engine Running) it should increase by 5 to 10 Psi. If it is within these spec, this should eliminate the fuel system.
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Laughing Gas
Joined: Feb 2004
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From: FLA
Originally Posted by slimslick
My first Question is, it a automatic or manual? (Automatic) You might try to do a fuel pressure test, Pressure should be about 30 to 45 Psi when the key is in the "ON" position.(Engine Running) it should increase by 5 to 10 Psi. If it is within these spec, this should eliminate the fuel system.
Hotshot
Joined: Nov 2000
Posts: 11,591
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From: Pflugerville, tx
Originally Posted by purplewg
After it sets over night, when I start it up it wants to chug, chug, chug. It lopes really bad. Now if I turn the key off and on about four times and let the pump build up each time it fires and runs well.
The checkvalve is on the pump, in the gas tank.
I just fixed a Jeep with very similar behaviour. had to replace both the regulator and the pump. At least the pump is removable without dropping the tank (on my 91 at least).
Sam
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Laughing Gas
Joined: Feb 2004
Posts: 974
Likes: 5
From: FLA
Originally Posted by sdetweil
Sounds like the fuel pressure regulator and or the backflow checkvalve.
The checkvalve is on the pump, in the gas tank.
I just fixed a Jeep with very similar behaviour. had to replace both the regulator and the pump. At least the pump is removable without dropping the tank (on my 91 at least).
Sam
The checkvalve is on the pump, in the gas tank.
I just fixed a Jeep with very similar behaviour. had to replace both the regulator and the pump. At least the pump is removable without dropping the tank (on my 91 at least).
Sam
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Laughing Gas
Joined: Feb 2004
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From: FLA
Originally Posted by sdetweil
no, I meant that the pump on the Jeep is directly removable from the tank near the rear end without having to pull any plates or drop the tank (like in a mustang)
Sam
Sam
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Hotshot
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Laughing Gas
Joined: Feb 2004
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From: FLA
Originally Posted by sdetweil
Mine was a cherokee, so I may be all wet too 
Sam
Sam
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Laughing Gas
Joined: Feb 2004
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From: FLA
Originally Posted by purplewg
Well, I finally got around to buying a new fuel pressure regulator. I had to pick up a part for my car so I went ahead and bought one. I'm not sure when I will get around to installing it but I will let you know the results.
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Laughing Gas
Joined: Feb 2004
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From: FLA
Originally Posted by purplewg
Well, I couldn't stand it. When I got home last night I replaced the solenoid in my car and that went so fast I started on the 302 in the Jeep. I replaced the fuel pressure gauge to no avail. Still does the same thing, surges when starting up and sometimes when I am just trudging along in a high gear and low RPM. It seems to be related. Memories started coming back from my old 302 HO days and I remembered the IPS. This is the Idle Position Sensor. Not to be confused with TPS (throttle position sensor). I plan to check it out soon as I can check it with a DVM. I had one go out one time and looked in the H manual and it said it needed to read somewhere between 6-10 ohms I think between two of the wires. I will have to look it up again. The EGR valve is connected but has no vacuum connected to it and is plugged. I need to make a plate to block it off completly I guess. Well the saga continues.