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Unread 03-22-2013, 05:27 PM   #16
Noplainsdrifter
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1974 CJ5 
 
Join Date: Jul 2011
Location: Hillsboro, Or
Posts: 513
I know with Holley 4 barrels that a good backfire can rupture the diaphram on the power vavle thus dumping fuel in the engine. But after reading your post a few times, it almost sounds to me that it's starving for fuel???? I would check float level again...

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Unread 03-22-2013, 05:40 PM   #17
neadb22
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1977 CJ7 
 
Join Date: Mar 2013
Location: Campobello, SC
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When I came back from work I reset the holley to specs again and set the float to where I had just a little spilling over the sight hole when I revved the engine. I put in a new diaphragm last week and have test driven it four times since with no backfire. Oh and its a 2bbl with a 1/2" plate under it on the stock intake.
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Unread 03-22-2013, 05:51 PM   #18
Noplainsdrifter
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Have you always had this problem or is it a recent one? Try going back to what you changed recently???? Do you think it's flooding out? As someone suggested, pull a spark plug and see how it looks. Is the exhaust smell like gas?

Edit-After reading the OP, I'm wondering if it has to do with your distributor not advancing? Maybe be spark related.
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Unread 03-22-2013, 06:06 PM   #19
neadb22
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I have had this problem since the drive home from purchasing the jeep. The distributor is advancing, I hooked it up to full time vacuum to check for function and it accelerated the timing, hooked it back properly, had my step son throttle it and timing did accelerate.
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Unread 03-22-2013, 06:08 PM   #20
neadb22
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Oh and if you ride in it around the 1.6 mile block you come back breaking of gas. I've run an entire tank of gas out just idling and driving exactly 88 miles. I've maybe idled it for a half hour or so a day for two weeks. It reeks of gas all the time
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Unread 03-22-2013, 07:05 PM   #21
cj5huntingrig
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Sounds to me like a serious vacuum leak. Have you put a gauge on it at idle?
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Unread 03-22-2013, 07:14 PM   #22
neadb22
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At idle my gauge reads 20 from the intake full time connection
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Unread 03-22-2013, 07:18 PM   #23
cj5huntingrig
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Wow. That's pretty good. Must be fuel delivery. (guessing)
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Unread 05-08-2013, 08:30 PM   #24
neadb22
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I know its been a while but most people never put what fixed it.....
I changed the pickup line filter in the tank, added new fuel lines(the rubber sections), added a fuel pressure regulator and set it to 3.5 and a gauge to verify. Drove it for the first time today after all of that, and in about 40 miles it ran like a champ the whole time. I wasn't even able to get a full 2 miles in prior to that.
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Unread 05-08-2013, 09:10 PM   #25
RDH
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Glad you got it figured...
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