Jeep Won't Run

1970 jeep, 134, Carter carb.
Problem: driving last week and it would loose power suddenly. Thought it was maybe a clogged fuel filter. Installed a new one, but still won't run.
Thought it was the fuel pump, I took it apart a few years ago, one of the check valves was stuck back then. So i bought a new fuel pump, thinking it's easy enough. Installed it, and it still won't run.
I did a tank liner about 10 years ago to seal it, thought maybe something came loose in it and clogged something. So I took a line and ran it to a gas can, still no go.
Now when I pour fuel directly in the carb it will run and idle just fine. Once I hit the throttle it dies immediately. I'm kinda stumped now. Please help guide me to fix this

 

Couple of thoughts.

Did you disconnect the fuel line from the carb and turn the motor to see if fuel pump is delivering fuel to the carb?
Have you checked to see if the Carb Bowl has fuel in it?

If fuel bowl in carb is empty and fuel pump is delivering to the carb, then the fuel bowl float needle is stuck/sticking or the float needs to be adjusted.

Was there fuel coming out of the base of the Carb?

Your situation sounds similar to an issue I was having with my Carter and 134 a couple of years back. In my case the fuel bowl float needle was sticking and causing issues.

Hope this helps.

 

I ran the output side of the fuel line and gas came out. I will disconnect the hard line at the carb to see if it's getting that high

 

No fuel leakage around the base of the carb

 

Looking into the carb, it's dry

 

I would bet money that the float valve in the carburetor is clogged with debris of some kind.

 

So I should tear into my carb? That's new territory

 

It is not difficult, and should not be something to worry over. Just remove the screws, I think there are six of them, and gently lift the top off of the bowl being careful not to bend the float by banging it against the body, and be very careful with the accelerator pump and metering rod.

Do this over a table or bench with a towel spread out to catch any dropped parts. Remove the pin holding the float, and remove the float and the valve will probably fall out of the valve body. Be careful with the valve most of them have a little plunger with a tiny spring inside, if that comes apart you must put it back together. With the float and float valve removed you can blow out the passage with compressed air.

Reassemble in reverse order, again being careful of the float, metering rod, and accelerator pump. The metering rod is very delicate and the needle on the end fits into a valve at the bottom of the bowl.

 

Floats can be made of various materials. Originals are brass, and soldered together. Over time, these can fatigue and leak fuel into them. This can cause the float to “sink”, but this causes a flooding/leaking gas around the carb base issue which you do not have. While you have the carb top off, and the float removed, shake it to listen/feel if it has fuel in it. It shouldn’t.
Your issue is fuel not entering the carb. You have disconnected the hard line into the carb and confirmed it spurts gas when you crank the engine? Then with the top off the carb, remove the float and needle valve. The needle valve is the gatekeeper, controlling the amount of gas the carb bowl gets. When the float drops, it opens the needle valve, allowing gas to flow past it, filling the bowl. When the bowl fills, the float rises, closing the fuel flow, keeping the bowl full without overflowing. Check your needle tip. Some have a soft viton tip, and others have just a cone pointed brass tip. If yours was viton tipped, did the soft tip come off and stick in the seat?
The float needs to be adjusted by gently bending the tab that the needle pushes on. Often, the correct position is the “top” flat of the float is parallel to the carb top gasket surface when the carb top is held up-side-down.
The needle and seat, and any filter leading to the carb, sounds like the restriction of gas you are experiencing.
Stop throwing parts on your Jeep without finding out what is needed to fix it first. Diagnose the issue. Now you know fuel isn’t getting in the float bowl, but gas is getting to the carb. It has to be a clog at the carb, or a stuck/jambed needle and seat.
-Donny

 

I have found the viton tipped float needles get "sticky" over time, maybe because ethanol, and they don't open easily enough, starving the mixture. In lieu of a new needle I sand the point lightly, and it can greatly improve the carb performance.

 

No gas is getting to the carb.

 

I blew the line out, from before the filter to my gas tank.

 

The rubber fuel line is too close to the exhaust. I see a single clamp only on what is possibly a straight-cut brake line tube. You're probably sucking air and not fuel at this point. You need to rework the fuel line. what fuel that is getting through only makes it as far as the closest point to the exhaust.

 

Fuel pump isnt pumping. Did i install it wrong?

 

Its only that close due to me disconnecting the hardline from the carb

 

Must be installed wrong. Even the first diaphram isnt moving when i crank the engine over

 

Clock that around 180 and try again.

 

Factory labeled in and out wrong?

 

In from tank, out to carb. The valve that is exposed is the outlet after the diaphragm that goes to the carburetor.

Unless your lines double back...
Edit... yeah your lines are weird.

 

No, the line from the tank curves around to the in side, and the "out" side of the pump goes up to the carb.