[ccfirelt]

I imagine this is all explained in the Haynes and Chilton manuals but until I get them I have to ask this.

What is the difference between the fuel pump in the tank and the one attached to the block on the passenger side? Which one goes bad first? Same with the filter. I believe there is one in or near the tank and also the inline one up near the carb. Would it be a good idea to change this when I put the weber on? Can this be replaced with a clear filter? The one on there now has 2 lines coming out of it. 1 to the carb and one headed back toward the tank.

thanks

[oldballz]

if you have a pump on your block you shouldnt have one in the tank. the block mounted ones are mechanical for carbureted motors, and put out 6-10 psi. the tank mounted are electric for fuel injected motors, and put out anywhere from 12-40 psi.

as far as fuel filters go mine is mounted on the drivers side frame rail near the fuel tank. i dont think carbureted motors have them just the inline ones under the hood. I think it would be a great idea to change it with your carb, its a cheap part, and yea you can use a clear one, if you were so inclined.

[ccfirelt]

Thanks for clearing that up. Where's that second line off the filter going? Do they make clear filters with 2 outputs?

[Richmond88yj]

On the carb yj's there is a max of 4-5 psi pressure to the carb or it will flood.

The 1 in 2 out filters help solve this. The carbs self regulate for 4 psi, the extra gas gets bled out through the second outlet on the filter. It routes down the drivers side of the block and back into the pump to be pushed to the carb again.

Just make sure the return line outlet on your filter is the one on top. If it's lower than the feed the carb one, the pressure bleeds out the bottom. Also after turning off the motor, it makes for hard starts as the line from the carb will bleed all the way back, filling the line with air.

EDIT: Make sure the feed line is the one entering the filter, the you should have 2 outlest on the carb side of the filter. Feed is the bottom one, overflow/return is the top one.

[ccfirelt]

Ok. Then this leads me to another question. When I install the Weber, I'll be installing the FPR along with it. Won't this do away for the need for the return line since the FPR will only be delivering the required 3.5 psi? In other words, all pressure above 3.5 psi should be backed up behind the FPR leaving no extra gas to bleed out into the return. Sorry. Not trying to be difficult, just trying t learn.

[Azboy]

I'd like to hear the answer to that as well.

Mine has the Weber (previously installed) and I've been fighting the drainage issue since I got it. After reading about having the one outlet "up", I went and changed mine. Didn't seem to make a difference. Still had to pump gas back to the carb. If I can't get that solved, I'm going to install an electric pump.

[bigh20rnr]

I installed a weber and have the filter located near the carb with the pressure regulator after the filter. Since the filter is before the regulator I still have the return line attached. Honestly have not had a problem with this setup. Azboy are you talking about drainage that causes the carb to run dry after you let it sit for a while causing hard starts?

Rick

[Azboy]

Sorry about the slow response....

From everything I've been able to detect, that is what its doing. Let it sit overnite and you pump the carb as you look inside...Nothing. Crank it and pump the pedal and eventually it will start. Only thing confusing is that I've tried starter fluid to see if it will start right off the bat and no...you still have to crank and pump the pedal.

[johny1i]

I agree that pumping the gas pedal a few times has always been typical for me. I have had a weber 32/36 on my YJ for 8 years now and if I am driving it every day and it's during the warm part of the year, I may get lucky and only have to pump the gas 1-2 times before I hit the ignition. If it doesn't get driven over the weekend, etc, it will take 2-3 attempts to start.

My fuel filter is in the stock location, almost just above the valve cover. After the fuel leaves the filter, I mounted a Holley fuel regulator (the kind you have to adjust with an allen wrench) on the driver's inner fender to get any possible fuel leaks away from the exhaust manifold, and then routed straight to the carb. I have always set mine for 3-3.5 psi and it will cruise at 75.