Carb Problems

Showing my youth my CJ is the first carbed car i've owned. When I got the CJ it would run fine after it warmed up and as long as you didn't have it at low RPM. Well bad low RPM performance and offroading isn't exactly a good match, so I bought and installed all new igniton components, a new furl pump and filter. Got everything installed and the jeep fired right up for about three seconds before fuel started pouring out of the carb. The fuel is coming out o the bottom of the carb, it appears that the fuel level is getting higher than the bowl and coming down the pump link and out of the carb.

Rebuilt the carb, same problem. Even though my goal for this project is to do all the work myself, I had a freind who owns a 60's Ford Falcon rebuild the carb, same problem. So I went and bought a reman carb. Guess what same problem, finally figured out it might be too much fuel pressure, and ran out at 4:55PM on a Sunday to the local Discount Auto Parts store and got a cheap 20 buck pressure regulator. The jeep worked ok for a little while, then ran out of gas. Rats. When I put gas in it the problem reoccured and I'm pretty sure the cheapo regulator is broken.

I need help! Am I on the right track with the fuel pressure? In a perfect world I'd spend the money and buy a EFI setup, but I don't have 1300 for it right now. Any help would be appreciated! Thanks.

 

Adjusted that with the first carb twice and I tried the stock setting and even a bit more agressive (so it would shut off earlier) on the new one.

 

The first thing I did when I got my '75 CJ5 was to ditch the crappy Carter carb and put on a Holley Economaster, number 2-286. Worked wonderfully offroad and fixed the low-end problems the Carter had. I ran the Holley for many years but have now switched to a 2-barrel Weber. My advice is to quit messing with the Carter and get a more modern carb.

 

I've only done an Offy Dual Port & a Holley 390 Comp. (w/home-spun off-road proofing copied from some pros) swap on my 232, but I found the Carter YF SB. to be a very reliable carb, practically immune to jumps & inclines, & wouldn't run anything else.

gj

 

Did Robert say whether his Jeep is a V8 or I6? If it's a 6, (unlike it's 2V cousin the BBD), the 1V Carter YF has a very good reputation. Someone here has had a lot of trouble with one leaking gas, but it's only seeped not poured.

Which is it - V8 or I6? Regardless of the specific carburetor, the only way that gas will come pouring out is if the float is stuck. On a 2V V8 carburetor, you must make sure that the tang that lifts and lowers the needle valve is level.

 

or the needle and seat aren't working properly...to shut off the fuel
I don't think pressure is the problem
needle and seat/ and or the float are the problem areas
although you changed the carb, you might toss the float in some gas and see if it does float

 

Good ideas about narrowing down which carb & also floating the carb float.

I once bought a brand new performance carb from a very reputable manufacturer and had to spend a day with emory cloth and superfine lapping compound to get everything to stop weeping and to fit properly.

These lapped fits are something re-manufacturers don't generally spend much time on. It only takes (1) high spot or nick to cause a leak or improper seat.

gj

 

I have to agree with the comment on a bad needle and seat. Check to see if the fuel filter is working. If it isnt then you could be sending dirty fuel to your carb which may contain particles that are keeping the float needle from seating. About the fuel pressure regulator. Is your pump mechanical or electric? If its electric I can understand the need for a regulator, but (forgive me I am naive and ignorant at times so correct me if there is a need) not with a stock mechanical.

Karl