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Post by philarchrider on Aug 3, 2020 14:49:03 GMT -5
I have a 48 CJ2a with a Carter WO carb. I have driven this for the past few years without any major issues. I did rebuild the carb this past winter and it ran fine for several months after. Now, after I drive it for a bit, the engine dies and it seems to run out of fuel. I have checked to make sure that I have fuel in the tank. If I pour some fuel directly into the carburetor, it will start and run for a very brief moment. I did notice that when I pour fuel in, there seems to be a lot of vapor. Could the fuel be boiling in the intake manifold? The heat riser seems to be operating freely.
I'm certain that my carburetor rebuild is not perfect with some vacuum leaks but it was certainly good enough to stay running with very little choke. Any suggestions? I am thinking it could be the fuel pump? There is no fuel filter between pump and carb and I plan to add one very soon. Could I disconnect the fuel line from the carb to verify that it is pumping while I crank the engine? Could it be an electrical issue? It seems like it wouldn't fire at all if it were electrical.
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Post by philarchrider on Aug 3, 2020 14:56:37 GMT -5
I also want to mention that I am a young (atleast compared to my 1948 Willys) rookie and I'm eager to learn and invest in the tools and knowledge to care for this machine. I do not own a vacuum gauge or tachometer but I think I should own both. If anyone has recommendations on which to purchase, please let me know. Thanks!
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Post by Deleted on Aug 3, 2020 18:08:31 GMT -5
I believe your on the correct path thinking the fuel pump is at fault. If your willing to invest in tools, most vaccume gages are also fuel pressure gages (at least in the automotive testing tools) so if you tee’d a gage in the fuel line between the pump & carb you will know if you have any fuel pressure as the engine heats up, could be a vapor lock issue also!...
Lee😉
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Post by philarchrider on Aug 4, 2020 12:01:02 GMT -5
Thanks. I would like to purchase everything I'm able from Scoutpilot to support this forum. It looks like he sells a fuel filter so I'll contact him directly.
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Post by Scoutpilot on Aug 4, 2020 13:33:21 GMT -5
Pictures would help a lot.
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Post by philarchrider on Aug 5, 2020 20:10:17 GMT -5
So I'm here to admit stupidity. I decided to see how much fuel was in the tank today and it was not dry but it was low enough that I decided to add a gallon and...
It started right up and ran great! So I was just out of fuel. This was a painful process that I get to put into the experience bank. Anyway, I do need to clean the carburetor a bit, adjust the idle mixture screw, and tidy up the throttle cable. Any tips for adjusting the idle mixture screw?
Thanks to Rick for taking to me today when I ordered my new fuel filter. I'm so excited to have found this forum to help with my learning.
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Post by rickg on Aug 5, 2020 20:59:14 GMT -5
So I'm here to admit stupidity. Been there, Done that.. |
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Post by Scoutpilot on Aug 6, 2020 5:24:20 GMT -5
We only truly learn from our mistakes. Not one of us here is perfect. And remember, there is no such thing as a stupid question the only exception being the one you didn't ask.
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Post by philarchrider on Aug 9, 2020 14:31:02 GMT -5
Thanks! I was able to spend some time yesterday installing the new fuel filter and line that I received from Scoutpilot. I had been having intermittent fuel leaks due to particles on the float needle/seat. I disassembled and cleaned the carb and I found a LOT of dirt inside. Install of the new fuel filter went very smooth and I was able to take my family (4 kids + wife) for a jeep ride around our farm. It was a wonderful afternoon. Now that I've solved the overflowing float bowl, I'd like to improve the general performance. I did set the float level yesterday upon re-assembly and it was WAY off. Now I'd like to adjust the accelerator pump, metering rod, and finally the idle mixture screw. I think I should be doing it in that order? I'm sure there is already a written procedure on here. Could anyone provide a link to it? Thanks!
As a side note, I do believe that my throttle shaft is worn and I will tackle that this winter. I'd like to confirm a vacuum leak, do I just hook a vacuum gauge near the throttle shaft? There is currently a square-head plug threaded into that port...
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Post by rickg on Aug 9, 2020 16:21:58 GMT -5
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Post by Scoutpilot on Aug 9, 2020 18:22:27 GMT -5
As a side note, I do believe that my throttle shaft is worn and I will tackle that this winter. I'd like to confirm a vacuum leak, do I just hook a vacuum gauge near the throttle shaft? There is currently a square-head plug threaded into that port... |
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Post by Deleted on Aug 9, 2020 20:57:30 GMT -5
Were I you (and I’ve been there) I would remove the fuel tank and thoroughly flush and clean it!, get rid of the source of the particles in your fuel system or it will be a PIA forever!....
Lee😉
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Post by philarchrider on Aug 10, 2020 7:55:46 GMT -5
Thanks, I will do the test with starting fluid today. I drove it yesterday and it bogs a bit off idle if I accelerate quickly. If I slowly ramp up the throttle, it's fine. With a bit of choke, there is no bogging. I would think this points to a vacuum leak, or an incorrect accelerator pump adjustment. Thoughts? Also, I'm attaching an image of my family enjoying the jeep. After all, that's why we have it!  |
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Post by Deleted on Aug 10, 2020 9:19:24 GMT -5
Nice looking outfit! 👍👍👍
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Post by philarchrider on Aug 29, 2020 20:13:33 GMT -5
Ok, I got busy with work and didn't have time for jeep rides for a couple weeks. I did the ether test by spritzing around the throttle shaft and manifold base. There was no change in RPM so that tells me I don't have any (significant) vacuum leaks. However, I still need to use partial choke to keep the engine from bogging on quick acceleration. To clarify, if I have the choke completely open, and accelerate gradually - no problems. But if I stab the accelerator, it will bog and nearly die. Both of these actions are in neutral without any load on the engine. So that's an issue but not keeping me from using the Jeep for family rides... Until today.
We drove around our property deep into the forest and when I accelerated, the engine died. Now that I've learned my lesson, I checked the fuel tank first and it was very low. After putting in 5 gallons, I still couldn't get the engine to fire unless I poured fuel directly down the carb. I figured it would take a few times to get it primed until the fuel pump filled the lines. After 6 or 7 tries, the engine will only run on the fuel that I pour directly into the carb and it dies after 5-10 seconds. The fuel filter bowl is only partially filled and it doesn't look like it's filling at all when the engine is running. I disconnected the fuel line into the filter and it's not pumping any fuel when I crank. All signs point to a failed fuel pump? Any advice? Is there an air bubble somewhere I'm not getting out? I'm not sure if fuel pumps fail suddenly like this or if I actually ran it dry and then it failed?
I'd appreciate any advice. The jeep is still in the woods and I'm dreading towing it back with a tractor along tight trails. Thanks in advance!
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