fuel timing

CHEESEMAKER · 09-04-2012, 11:21 AM

I tested mine with no gas cap on.

1fast67 · 09-04-2012, 11:59 AM

It was just a thought. I was having fuel delivery problems with my 79 marathon and i bought a pump rebuild kit and it took care of my issue. One of the plastic diaphram was cracked.

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devon · 09-04-2012, 07:46 PM

well there is two other things that i just did to mine the other day also that could be the issue especially if there is a flow problem. take off the pump nad put a piece of bag just over the hole. of it keeps the bag standing straight up then it has a good vacumm. i had to replace the sleeve gasket with some silicone and i went back to the same old 1-2 inches. (after it got presukre again it bogged out on me) alsocheck the rings. take off the exhast from the motor and use something to move the piston with, if it moves (besides a very slight spin, it is the rings. they like to burn out after a while.

CHEESEMAKER · 09-04-2012, 10:27 PM

I've ran a compression tester on mine. It's running 120ish! So, i have enough compression. I just tried turning it over with full choke, hand over the carb intake, and no fire. I pulled the spark plug, it was popcorn fart dry. And it has spark! So, my issue has to be fuel pump issue.

suffolklou · 09-05-2012, 06:32 AM

If there is no fuel in the bowl of the carb, it is the fuel pump or the needle valve. If there is fuel in the bowl, probably carb...

Lou S.

1fast67 · 09-05-2012, 09:54 AM

Heres my suggestion: scribe he fump with a pick so it goes back together correctly and take it apart clean it and make sure the diaphrams are not cracked. Its a pretty common on the pumps. There are two diaphrams and two gaskets.

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CHEESEMAKER · 09-08-2012, 01:01 AM

Ok, I tore apart my fuel pump, and everything looked good inside and out. Cleaned a little varnish out of some corners of the pump. The diaphragms, looked good, no cracks or tears. Are they supposed to be rubber, or plastic like? Mine were hardish, almost like plastic. But looked fairly in good condition. so, I pulled the carb, and it all looks good, just a little crap in the bowl, but considering how old this thing is, it looks good. Clean butterflies and such.

But I did find this, which is the fuel pump base gasket, insulator.
Which might be causing my weak fuel delivery? Hopefully, a new one will be cheap if I can't source one off the non running cart.

1fast67 · 09-08-2012, 01:42 AM

My pump has the clear plastic diaphrams. You can still buy those insulators. Make sure you buy the insulator and fuel pump gasket when you bolt everything back on.

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suffolklou · 09-08-2012, 01:49 AM

My insulator came off just like yours. I haven't had any luck finding one. Found one on a website, only to call and find kit that they were discontinued last year. In another thread on here someone mentioned they made one out of plexiglass. I bought an electric fuel pump, and it is working good now.

Lou S.

1fast67 · 09-08-2012, 02:20 AM

Try vintagegolfcartparts.com. i hope im not out of line here since they arent a sponser but its hard findung parts for older carts. Especially mine since its a 79 gasser.

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09-04-2012, 11:21 AM	#11
CHEESEMAKER Not Yet Wild Join Date: Apr 2012 Location: Tillamook, OR Posts: 37	Re: fuel timing I tested mine with no gas cap on.

09-04-2012, 07:46 PM	#13
devon Not Yet Wild Join Date: Aug 2012 Location: ohio Posts: 51	Re: fuel timing well there is two other things that i just did to mine the other day also that could be the issue especially if there is a flow problem. take off the pump nad put a piece of bag just over the hole. of it keeps the bag standing straight up then it has a good vacumm. i had to replace the sleeve gasket with some silicone and i went back to the same old 1-2 inches. (after it got presukre again it bogged out on me) alsocheck the rings. take off the exhast from the motor and use something to move the piston with, if it moves (besides a very slight spin, it is the rings. they like to burn out after a while.

09-04-2012, 10:27 PM	#14
CHEESEMAKER Not Yet Wild Join Date: Apr 2012 Location: Tillamook, OR Posts: 37	Re: fuel timing I've ran a compression tester on mine. It's running 120ish! So, i have enough compression. I just tried turning it over with full choke, hand over the carb intake, and no fire. I pulled the spark plug, it was popcorn fart dry. And it has spark! So, my issue has to be fuel pump issue.

09-05-2012, 06:32 AM	#15
suffolklou Getting Wild Join Date: Aug 2012 Posts: 87	If there is no fuel in the bowl of the carb, it is the fuel pump or the needle valve. If there is fuel in the bowl, probably carb... Lou S.
suffolklou Getting Wild Join Date: Aug 2012 Posts: 87

09-08-2012, 01:01 AM	#17
CHEESEMAKER Not Yet Wild Join Date: Apr 2012 Location: Tillamook, OR Posts: 37	Re: fuel timing Ok, I tore apart my fuel pump, and everything looked good inside and out. Cleaned a little varnish out of some corners of the pump. The diaphragms, looked good, no cracks or tears. Are they supposed to be rubber, or plastic like? Mine were hardish, almost like plastic. But looked fairly in good condition. so, I pulled the carb, and it all looks good, just a little crap in the bowl, but considering how old this thing is, it looks good. Clean butterflies and such. But I did find this, which is the fuel pump base gasket, insulator. Which might be causing my weak fuel delivery? Hopefully, a new one will be cheap if I can't source one off the non running cart.

Today
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09-04-2012, 11:59 AM	#12
1fast67 Gone Wild Join Date: Mar 2012 Location: spokane,wa Posts: 974	It was just a thought. I was having fuel delivery problems with my 79 marathon and i bought a pump rebuild kit and it took care of my issue. One of the plastic diaphram was cracked. Sent from my LG-P999 using Tapatalk 2

09-05-2012, 09:54 AM	#16
1fast67 Gone Wild Join Date: Mar 2012 Location: spokane,wa Posts: 974	Heres my suggestion: scribe he fump with a pick so it goes back together correctly and take it apart clean it and make sure the diaphrams are not cracked. Its a pretty common on the pumps. There are two diaphrams and two gaskets. Sent from my LG-P999 using Tapatalk 2

09-08-2012, 01:42 AM	#18
1fast67 Gone Wild Join Date: Mar 2012 Location: spokane,wa Posts: 974	My pump has the clear plastic diaphrams. You can still buy those insulators. Make sure you buy the insulator and fuel pump gasket when you bolt everything back on. Sent from my LG-P999 using Tapatalk 2

09-08-2012, 01:49 AM	#19
suffolklou Getting Wild Join Date: Aug 2012 Posts: 87	My insulator came off just like yours. I haven't had any luck finding one. Found one on a website, only to call and find kit that they were discontinued last year. In another thread on here someone mentioned they made one out of plexiglass. I bought an electric fuel pump, and it is working good now. Lou S.
suffolklou Getting Wild Join Date: Aug 2012 Posts: 87

09-08-2012, 02:20 AM	#20
1fast67 Gone Wild Join Date: Mar 2012 Location: spokane,wa Posts: 974	Try vintagegolfcartparts.com. i hope im not out of line here since they arent a sponser but its hard findung parts for older carts. Especially mine since its a 79 gasser. Sent from my LG-P999 using Tapatalk 2

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