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Unread 05-04-2010, 03:39 PM   #1
lmk3087
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1977 CJ7 
 
Join Date: May 2010
Location: Gainesville, FL
Posts: 9
Confused . . .

Okay, so I have been attempted to fix up a 77 CJ7 that I just bought, and I'm a little green. I have replaced and or cleaned all the usual suspects. While I was working on it, a fuel line sprung a leak, it shouldn't be too difficult to replace, but it raised an interesting question to me. The problem I have been having is that after revving, it has been stalling, though, I can keep it alive, if I stay on the gas, also, when I start her up, I typically have to pump the gas several times. Now here is what I was confused about. The line that sprung a leak, comes from a fixture? on the bottom front bottom right side of the engine, though the fuel filter, into the carb. That line only leaks when I attempt to start the Jeep up (while turning the key). When I pump on the gas, gas spurts into the carb, but doesn't cause leakage there? Could improper flow in the former tube be causing the stalling, and hence why if I pump the gas it'll stay running? Thoughts? please and thank you.


Last edited by lmk3087; 05-05-2010 at 10:50 AM..
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Unread 05-04-2010, 05:30 PM   #2
turbogus
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1978 CJ5 
 
Join Date: Jun 2005
Location: Albany~town, Oregon, Oregon my home and for 200 billion slugs
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When you're pumping the accellerator pedal this pushes a lever on the accellerator pump, hence you see fuel being squirted into the throttle body. As the name implies this circuit is intended as boost for when you're overtaking another vehicle on the road. As you mentioned a leaking fuel line, there could be contaminants in the fuel line that may have plugged the fuel filter or the idle circuits. Did you find any rust, dirt or sand in the fuel line/filter? If so you may look at rebuilding your carberator. Best of luck
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Unread 05-05-2010, 10:49 AM   #3
lmk3087
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1977 CJ7 
 
Join Date: May 2010
Location: Gainesville, FL
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Thanks turbogus. I didn't notice any debris in the fuel filter. Although the line itself looks pretty corroded, hence the leak. So when I push on the accelerator, fuel goes through a different line then? not the line where the leak is coming from?
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Unread 05-05-2010, 02:46 PM   #4
kakai81
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1985 CJ7 
 
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Location: San Marcos, Texas
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Pics would help. If you use photobucket, you can post the link. By "fixture" do you mean the charcol canister? Or possibly where the charchol canister should have been and a PO removed it with some shoddy garage plumbing. I've seen that a few times lately.
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Unread 05-05-2010, 03:22 PM   #5
jalves3
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1967 CJ5 
 
Join Date: Apr 2010
Location: Yuba City, CA
Posts: 143
I am totally unfamiliar with your setup but I will try and give some general help. Any defects in the fuel line before the fuel pump can allow air to be drawn in (even if they do not leak at rest) and cause fuel starvation at anything above idle. A partially plugged line will also cause the same symptoms. Get a fuel pressure gauge and see what is gong on and if there is a pressure problem, start at the tank and work to the carb. Check 1 component at a time.
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Unread 05-05-2010, 04:07 PM   #6
lmk3087
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1977 CJ7 
 
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Location: Gainesville, FL
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lol, good advice all around, i don't think PO did anything, almost everything on this is stock, its really neat. I like the one by one jalves. I may be a little ignorant, but that sounds like a good idea, and I shall try my best. I checked the tank, and cleaned the venturi, but that is it so far, other than other standard maintenance.

Here are some pictures, starting from the fuel filter, going down, the fourth is where the leak is, and the fifth is the "fixture".

New Baby pictures by lmk3087 - Photobucket
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Unread 05-05-2010, 04:20 PM   #7
jalves3
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The "fixture" is the fuel pump. Everything between it and your tank operates on suction (it pulls gas to the pump) and everything after is under pressure.
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Unread 05-05-2010, 05:07 PM   #8
lmk3087
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1977 CJ7 
 
Join Date: May 2010
Location: Gainesville, FL
Posts: 9
neat jalves. when I push on the gas, does it go through the fuel pump/filter and so on, if so, why would it not leak when I push on the gas? also, do you think the stalling after revving could be caused by a bad fuel pump?
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carburetor , stalling , stalling at stop , start , trouble

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