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Post by Scoutpilot on Aug 30, 2020 4:53:20 GMT -5
It does sound like the pump is the issue. But it could also be an air leak into the fuel line or a clogged vented fuel tank cap.
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Post by philarchrider on Sept 2, 2020 14:32:48 GMT -5
Ok - I was able to do a little more troubleshooting today. I disconnected the fuel line going into the carburetor and cranked the engine. I assume fuel should pump out that line but it did not. I removed the fuel pump and as I was removing it, it sprayed fuel all over. After removing it, I could operate the pump manually and it pumped the fuel that was in the pump. When I put it back on though, it's not pumping fuel into the carburetor. I'm stumped...
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Post by Scoutpilot on Sept 2, 2020 18:25:22 GMT -5
Do you have a spacer between the pump and block?
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Post by philarchrider on Sept 3, 2020 8:30:00 GMT -5
I don't think so - only a gasket.
Am I correct that if I disconnect the fuel line from the carburetor inlet and crank the engine, it should be squirting fuel?
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Post by Scoutpilot on Sept 3, 2020 9:22:03 GMT -5
Yes. Are all of the fuel line connections tight? How old is the rubber connecting tube from the hard line to the pump? Air infiltration will diminish or stop fuel flow.
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Post by philarchrider on Sept 3, 2020 11:55:16 GMT -5
All connections are tight and it's actually hard-lined all the way to the fuel pump. For some reason mine doesn't have a rubber connector. I blew compressed air backward through the line and into the fuel tank; it was definitely bubbling inside so that seems clear. I have't disassembled the fuel pump yet but it sounded like something was rattling around inside when I had it off. Is that normal?
I'm planning to carefully check for air leaks on the suction side and if I don't find any, I guess I'll disassemble the pump. I assume it's rebuildable?
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Post by Scoutpilot on Sept 3, 2020 14:20:25 GMT -5
Some pumps are rebuildable. Some not. I'm surprised that this Jeep has a hard-line fuel line all the way to the pump. The vibration from the motor will weaken and wear out the threads of the 'IN' port of the pump. There's an air infiltration point. You should have a rubber hose instead. They are readily available through any reputable vendor.
A "Rattling" sound? Not supposed to unless one of the valves has come loose.
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Post by philarchrider on Sept 5, 2020 11:23:43 GMT -5
Ok - progress! Scoutpilot - you were correct about the rattling sound. I disassembled the fuel pump and one of the press-in valves was completely loose. I gently seated them using a socket to tap them firmly into their corresponding bores. After re-installing the fuel pump, it is pumping better than ever! I'm guessing they have been leaking for some time and it finally came completely out and stopped pumping any fuel. So now that the fuel pump is pumping more effectively, I think I need to re-adjust the carb. When I completely open the choke I'm getting some backfiring (which has NEVER happened before). Any guidance on what to adjust first?
Thanks again for the guidance, we're definitely going to have some family rides with the fantastic weather this weekend!
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Post by philarchrider on Sept 5, 2020 12:15:09 GMT -5
Another update. I did a more careful test spraying ether around the throttle shaft. I did find one location where it affected the idle; although it was the opposite of what I expected. When I sprayed the ether, the engine actually bogged down.
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Post by Scoutpilot on Sept 5, 2020 15:37:37 GMT -5
Where exactly?
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Post by rickg on Sept 5, 2020 18:44:33 GMT -5
If a press in valve rattled loose it's a good bet it will happen again. I'd be sourcing a quality (rebuildable) pump for my kit..
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Post by Scoutpilot on Sept 6, 2020 5:07:01 GMT -5
Perform a vacuum tuneup as described here; link
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Post by philarchrider on Sept 8, 2020 15:21:25 GMT -5
Scoutpilot, do you sell a rebuild kit for an original fuel pump? I do have an old fuel pump in a box of spares but it doesn't work. The only markings I can find are: 5623108 cast on the inside near the actuator arm. I'm also attaching 2 images.   |
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Post by Scoutpilot on Sept 8, 2020 15:48:03 GMT -5
That is a reproduction. It can be rebuilt but has pressed-in valves. Great care must be taken in the rebuild process. The old-style brass valves I use can be easily deformed when pressed in. If you want to rebuild it yourself contact Then and Now for a kit. Call me when you are ready to rebuild it.
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