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Unread 06-19-2013, 08:15 AM   #1
aglinks
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CJ7 fuel delivery question

Ok so I have read a couple of threads with similar questions but I am not 100% my situation matches up. My CJ stalled on monday and left me stranded in the blazing 110 degree AZ heat for a few hours. It was running great for about an hour and half and then it slowly started to lose power. Within 30 seconds of starting to lose power it died. I let everything cool down for about 20 minutes (thinking maybe the fuel pump had overheated or something) and it started back up and ran for about 5 miles. After the 5 miles it died and would not start. After an hour and a half and I had to call a tow truck. Should I be on the look out for fuel pump problems, vapor lock issues, ignition problems...anything I can rule out? I have a Chevy 350 with TBI and it was running at about 200-205 degrees when all this happened. Thanks guys!

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Unread 06-26-2013, 10:30 AM   #2
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I've replaced the fuel pump and filter and so far things seem to running smooth. Fingers Crossed!
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Unread 06-26-2013, 10:37 AM   #3
LumpyGrits
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Spares of each in the Jeep would be smart
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Unread 06-26-2013, 11:04 AM   #4
WindKnot
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Is the fuel return line still in place? If so, is the filter clocked correctly?

One thing about the fuel return line, it cut down a LOT on vapor lock.
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Unread 06-26-2013, 11:27 AM   #5
Oily
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Quote:
Originally Posted by aglinks View Post
It was running great for about an hour and half and then it slowly started to lose power. Within 30 seconds of starting to lose power it died. I let everything cool down for about 20 minutes (thinking maybe the fuel pump had overheated or something) and it started back up and ran for about 5 miles. After the 5 miles it died and would not start.
Do you have a catalytic converter ? Pevious ones, maybe even the new ones, when old, used to melt the pellets which would choke exhaust. No air out, no air/fuel mixture in.
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Unread 06-26-2013, 11:52 AM   #6
82JeepCJ7
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Ethanol content in the fuel will cause a vapor lock type situation. I avoid gas with ethanol in it like the plague.

If it repeats the symptoms, try running it with the gas cap off and see what happens.
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Unread 06-26-2013, 11:56 AM   #7
tbart16
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i would love to have ethanol free gas closest station for me is about an hour . sounds like vapor lock
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Unread 06-26-2013, 12:12 PM   #8
aglinks
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I have TBI and was told that vapor lock was highly unlikely, is that true?
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Unread 06-26-2013, 12:36 PM   #9
WindKnot
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Yes. Unless for some reason there's no return line. With the return line the fuel is always moving. No return line the fuel can sit and heat up.
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Unread 06-26-2013, 12:44 PM   #10
aglinks
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Im pretty sure I have the return line and everything is hooked up properly, Ill take a second look tonight when I get home from work. Sorry, I am a mechanical noob haha
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Unread 06-26-2013, 12:48 PM   #11
LumpyGrits
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TBI=v'lock NOT likely unless you have no return line.
Where is your f'pump mounted?
If you can--Post pics of the engine bay show'n fuel line routes.
LG
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Unread 06-26-2013, 03:56 PM   #12
aglinks
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Ill take pictures this weekend, Its dark when I leave for work and dark when I get home haha.
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Unread 06-26-2013, 04:51 PM   #13
james04si
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The GM TBI has one line coming in and a return line going out of the actual throttle body. You defenatly should not have the original fuel filter installed as the TBI is not very happy with less than 10# of pressure and ideal is 13# if I am not mistaken. I have heard that fuel pump placement has been issues for some people. Best location is an in tank pump but if not then as close to the tank and higher up is second best. Mine is on the frame right in front of the rear shock. It is also best practice to have a filter before the pump to keep crap out of the actual pump mechanism.
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Unread 06-26-2013, 10:53 PM   #14
dg6772
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I put my pump in the tank with no issues thus far. It takes a little imagination though.

Dave in Muskegon
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Unread 07-04-2013, 12:58 PM   #15
aglinks
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Ok so here is a picture of where my fuel filter and pump are mounted. I am pretty novice at nearly everything mechanical but I'm pretty sure there is no return line...(also hopefully I uploaded the image properly)
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