Fuel Boiling In Pump?!? Engine Stumbles Under Load And Dies

If you have to seal a connection please do not use a tube or bottle dispensed semi-liquid. It will be dissolved by the gasoline and find its way into anywhere it can flow with the fuel. Teflon Tape is best. Just leave the first two threads of the connector clean. Please don't take this wrongly. Do you own a maintenance manual for this jeep?

 

Ya I had been specifically told elsewhere to avoid teflon tape and ONLY use this specific loctite haha. I think most of my time is spent figuring out who to listed to in this world of mis information. I guess the gunk in my pump shows the loctite might not have been then right call lol

 

That can be valid, where errant scraps downsteam can interfere with delicate equipment.

I mostly use old fashioned Permatex #2 goo, or their bush-on Aviation sealer. I reckon that at worst, at least it is compatible with petroleum fuels and lubes.

 

Ya the last time I used loctite before the pump was just before I completely rebuilt and cleaned the carb. and was also only about 10 miles of driving or so ago. So I'm hoping whatever would have come loose has already been caught at the carb side. That said, if the things I'm chipping away at don't work, I'll know what to try next hhaa.

So Here's where I'm at today:
I reassembled the fuel pump and reinstalled. I need 24hrs to let the permatex grey on the gasket cure before I can start her up so in the meantime I flared the end of the fuel line coming from the tank, hooked up the flexible crossover fuel line to the pump (still amazed I had that!), and added a heat shroud to the entire length of fuel line that passes by the manifold. the line from the fuel tank along the rail was a few inches shorter than I'd hoped for so the heat shield is extra insurance. In the pic, its pulled back. After I ensure there isnt a leak at the fittings, I'll pull the heat shield out to cover the whole line.

While i'm waiting to find the correct fuel filter, I had to hook up the old one with rubber fuel hose between the pump and the carb. Once I get a screw-in type filter that fits my npt fittings, I'll be able to route a hard line from the pump to the carb.

For now, I'll at least be able to see if there are any suction leaks on the inward side of the pump.

This filter looks kinda cool. Its serviceable and period correct. also it has npt ports so I can, in theory, attach it directly in front of the carb.
https://www.amazon.com/gp/product/B07N7S2D4G/ref=ewc_pr_img_1?smid=A1FJ1WMPKJVUMQ&psc=1

 

Have you looked on eBay?

 

That appears to be a reproduction of the AC style like I have on my CJ2A, you would need to source replacement elements but they are available.

As Scoutpilot mentioned, take a look on eBay, I just did and saw several of the Carter ceramic filters for about the same price. Those are the best.

 

I ordered the glass bowl style I posted earlier before I read your comments about the ceramic type! haha. I'm sure it'll be great anyway! I just hope it fits in situ.

I pulled the gas tank today and blew out the line. rinsed the tank out and realized there wasn't rust. just flakes of varnish and some other crap. Also a critter/bug about 1/4 inch long floating in there. I wonder if that could have been in the fuel line at some point haha. I'm out of town for the weekend but will update next week when Im back and get it back together!

 

The one you posted will work fine "haha".

 

I got the filter and it's really nice! Just got it hooked up. The gas tank is currently out and needs a last rinse before I can install in the next couple days but I figured I'd share my hard line setup as of now. It's getting closer! There now will be no "unauthorized" use of rubber hose and worm clamps anywhere between the fuel tank and the carb. Hopefully this will cure the bubbles in the fuel pump

The brass hex cap at the carb can be removed and I now have a place to attach my fuel pressure gauge when needed.

Mr Gasket fuel pressure regulator now sits on the passenger side of the engine.

All lines are as far away from heat as I could afford to move them.

 

I went ahead and only used teflon tape on NPT fittings that live before the fuel filter. Nothing on any of the inverted flare fittings or anything that sits between the filter and the carb. Fingers crossed there are no leaks.

 

Nice work!

 

Finally got the tank gas hooked up and I'm happy to report that I drove it for about an hour today and it seems to be functioning! The only issue was when I accidentally ran it out of gas and my girl had to wait for me to walk to a gas station hahhaa. We even attended a cars and coffee event this morning and got back without any (other) issues.

The fuel level stays at or just below the screen in the pump still.... but the fuel filter at the carb is full and the fuel pressure gauge shows 2.5lbs. There's an occasional bubble in the pump itself but I think its because the level stays so low that it's transferring little bits of air from one chamber to the other and that's what I'm seeing. I'm wondering if the fuel pressure regulator has something to do with why the fuel level never gets higher than the screen in the pump. Back pressure maybe?

Either way, it's getting ample fuel to the carb and seems to be running happier than before!

Thanks for the help everybody!

 

Good Job!

 

So you tackled several potential problems. What do you think was the main problem?

 

My guess is something in the gas tank was clogging the line and because of the mishmash of rubber hoses clamped to steel lines, the negative pressure in the line before the pump might have been sucking in air at that seal. Starving the carb when it needed fuel the most. I found a ton of flakes and a big dead bug in the gas tank that might have been the culprit.