Update on A-2

Cobra5 · Unread post by **Cobra5** » July 30th, 2009, 11:52 pm

Well I finally found time to rebuilt the carb and gave it full choke b ut found that I wasn't getting any gas up to the clear fuel filter. So I though that the pump went out and disconnected the end and cranked it over. I started getting gas from the pump outlet so decided to hook everything up and continue to crank. Gas eventually filled the filter but I still couldn't get her to turn over. One last attempt I shot starting flid in the carb and she lit off and continued to run. I turned her off and restarted several times with no problems. Of course until I decided to let her run and noticed a fuel leak at the fuel pump outlet fitting. I tightened it up and no problems. I took her for a spin and had her up to 55 mph and took out climbing in a buddies gully with no hiccups, except there is a little backfire so I'll have to tweek the timing and the carb but other than that she runs like a raped ape. So here are a couple photos. I have a few more cosmetic things to do before I call this one complete.

Here she is supporting that new top from Mr. Recovery.

I decide that my mechanic deserved a chance to drive her.

toptiger · Unread post by **toptiger** » July 31st, 2009, 3:30 am

great looking jeep. glad its running well;

Mr. Recovery · Unread post by **Mr. Recovery** » July 31st, 2009, 6:23 am

Glad to hear you got her running and She sure looks fine with her new hat.

Looks like you will need to get another one for your "Mechanic!

Unread post by **rickf** » July 31st, 2009, 6:30 am

Looks good, you might want to pick up another pump though. It should fill the carb within ten seconds of cranking so I think the diaphragm is shot. Make sure you are not putting gas in the crankcase through a cracked diagram.

Rick

Ralph Fuller · Unread post by **Ralph Fuller** » July 31st, 2009, 7:36 am

Backfire: After my MUTT warms up, I can run with the choke out about 1/4 inch and have no backfire when I let up on the gas. If I put the choke all the way in, it backfires or "pops" when I let off.....music to my ears.

raymond · Unread post by **raymond** » July 31st, 2009, 9:15 am

k8icu · Unread post by **k8icu** » July 31st, 2009, 9:55 pm

the truck looks good! Nice work and you don't look too nervous letting your mechanic drive it...

Cobra5 · Unread post by **Cobra5** » August 1st, 2009, 12:29 am

rickf wrote:Looks good, you might want to pick up another pump though. It should fill the carb within ten seconds of cranking so I think the diaphragm is shot. Make sure you are not putting gas in the crankcase through a cracked diagram.

Rick

I took the pump apart and the diaphragm is fine. I checked the oil for fuel and its still clean. I wonder if the diaphragm is just stretched out.

Ralph Fuller wrote:Backfire: After my MUTT warms up, I can run with the choke out about 1/4 inch and have no backfire when I let up on the gas. If I put the choke all the way in, it backfires or "pops" when I let off.....music to my ears.

I run with the choke full in after it warms up and I get a little backfire. If I pull the choke out it idles faster but will still pop. However it runs a lot better since the carb was rebuilt. I couldn't get it past 30 mph prior to the rebuild.

Unread post by **rickf** » August 1st, 2009, 9:34 am

If anything it would be the spring that pushes the diaphragm down. It is this spring that determines pressure, The arm to the cam is what pushes the diaphragm up and pulls fuel from the tank. The spring pushes the diaphragm back down and forces fuel to the carb. If the diaphragm is stretched it will reduce the volume. Alcohol will deform the diaphragm.

Rick

sherwan_88 · Unread post by **sherwan_88** » August 1st, 2009, 12:46 pm

Congratulations Cobra! Happy Riding!

What a beauty i might say....

k8icu · Unread post by **k8icu** » August 1st, 2009, 4:02 pm

I could be wrong but M151s run better with the choke pull slightly out about a 1/4". Set the choke and then set the idel.

Unread post by **rickf** » August 1st, 2009, 8:27 pm

All you guys who insist you have to use the choke at all times should consider this. The choke is blocking off some of the airflow through the venturi. As the rpm goes up the cfm required goes up. The choke is still closing off the venturi so as the need for air rises the restriction increases. End result will be carbon fouled plugs and about ten MPG. When the carburetor is set up correctly along with the timing and running a 180 thermostat there will be no need for the choke. Ask Diamondjim, He even did it with an emissions carb with a 28 jet in it. No choke from here to Ca.!

Rick

Cobra5 · Unread post by **Cobra5** » August 3rd, 2009, 6:12 pm

rickf wrote:All you guys who insist you have to use the choke at all times should consider this. The choke is blocking off some of the airflow through the venturi. As the rpm goes up the cfm required goes up. The choke is still closing off the venturi so as the need for air rises the restriction increases. End result will be carbon fouled plugs and about ten MPG. When the carburetor is set up correctly along with the timing and running a 180 thermostat there will be no need for the choke. Ask Diamondjim, He even did it with an emissions carb with a 28 jet in it. No choke from here to Ca.!

Rick

Not to worry Rick I'm with you. The choke should be used during warm up and than pushed in. If it runs better with some choke out than theres a problem.

I'll get another pump so I have one on hand. BTW: The clear filter does fill up when you accelerate.

Update on A-2

Update on A-2

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