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Unread 08-05-2013, 08:15 AM   #1
stephenspann27
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Bought a '75 CJ5 Need Advice

I picked this up for $4k.

https://drive.google.com/folderview?...Fk&usp=sharing


View pics in the google drive link above.
The frame doesn't seem to have any rust. The tub and fenders are fiberglass. It's a 304 V8 with 3 speed.
This is the issue I'm having. It has the original motorcraft carb, there is an electric fuel pump installed. The PO said he rebuilt the carb, which I believe. He said he thinks it's running a little rich due to too much fuel pressure. After driving it more, it does seem to be a richness problem. It will buck and die. If I wait a few minutes it will start back up. My question is. Do you think I should start by pulling the carb apart and going through it, or slap a FPR on it? I have a lot of experience with motorcycle carbs, but none with automotive. To me, even if the fuel pressure is kind of high, the float needs should be stopping the fuel flow when the bowl is full. Looking for advice on this electric fuel pump/carb situation.

Thanks

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Unread 08-05-2013, 08:25 AM   #2
turbogus
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Nice Jeep, I could dig a fiberglass tub if it weren't for my budget and the electrical hassles post install. Perhaps an inline fuel regulator needs to be installed between the pump and the carb. I'd first check the fuel filter (or replace it as a matter of course) especially if it has the stock metal tank and has been sitting. I've got a Carter AFB on my 360 and it uses the mechanical pump just fine, although after getting 'Black Betty' outta bed from the winter storage she needs time to get fuel from the tank. Normally this is only after two or three startup tries though, I imagine an electrical pump would help in this case but since this is only at the start of off road season it's not a pressing issue for me.
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Unread 08-05-2013, 10:25 AM   #3
stephenspann27
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Anyone running an E-pump with no regulator?
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Unread 08-05-2013, 11:04 AM   #4
jdarg
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If you are over 5PSI you need a regulator, assuming you are running a 2100.
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Unread 08-05-2013, 03:42 PM   #5
stephenspann27
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Quote:
Originally Posted by jdarg View Post
If you are over 5PSI you need a regulator, assuming you are running a 2100.
Yes it's a motorcraft carb. I'll see if I can get a gauge rigged up.
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Unread 08-05-2013, 06:04 PM   #6
tiny1985
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Nice jeep
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Unread 08-05-2013, 08:46 PM   #7
stephenspann27
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Quote:
Originally Posted by tiny1985 View Post
Nice jeep
thanks, you think I got a good deal?


So i hooked up a gauge from my "fuel system test kit" and It read 2psi.. if that. So I was thinking I've got a problem. Just to be safe I hooked up my "vacuum and fuel pressure kit" and I got 4.5psi. I believe the 4.5psi. Which should be ideal right? I guess it's time to pull the carb and go through it. I did verify the accelerator pump is working.

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Unread 08-05-2013, 09:28 PM   #8
stephenspann27
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Installed 3rd gauge. 4.5 PSI.
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Unread 08-07-2013, 09:39 PM   #9
stephenspann27
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Found that the float level was way off, and the top gasket was out of wack. It's running much better now but still needs some fine tuning.
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Unread 08-08-2013, 07:28 AM   #10
turbogus
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That's great, at least you're on yer way to fixing this.
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The parts shop that stocks part for Skylab II will not have parts for our year/model of Jeep
We cannot accurately judge the trajectory of a speeding critter (cat, dog, sasquatch)
Record heat waves and floods only occur when we visit that area
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Unread 08-09-2013, 04:39 AM   #11
strvger01
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looks like a nice jeep to my eyes!
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Unread 08-09-2013, 05:48 AM   #12
hotrod351
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should have around 7 psi. id put a stock mech. fuel pump on it and keep the electric for backup. but yeah the float level being to high would cause it to run rich, thats a cheap easy way to richen up a lean burning engine. sometimes people will do it to keep the engine from pinging, did it on my 454 that was high compression, it works for that purpose but also kills gas mileage. glad you found out the problem. amazing how some people cant rebuild a simple autolite carb without messing it up.
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Unread 08-10-2013, 01:00 PM   #13
stephenspann27
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It has some lope at idle. I'm not sure if it's the idle mixture off or an aftermarket cam. I'll try to fine tune the idle mixture soon. Any more power in this chassis would be scary. It gets pretty squirly under hard acceleration.
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Unread 08-10-2013, 04:41 PM   #14
stephenspann27
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Noticed I have some smoke coming from the oil filler cap. There is a nippe on the cap, is that supposed to be routed back to the intake? Looks like I need to do a compression test.
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