Fuel in intake

GallopinGhost · 05-31-2019, 02:44 PM

might be on to something, base of carb body is warped .011", top of base plate is .002"

I think I'll find some socket head screws to replace the Phillips head ones.

Quote:

Originally Posted by FED 387

is the base plate or carb body warped???

GallopinGhost · 05-31-2019, 05:44 PM

Well I made some progress. The screws are #12, so I didn't have any of those, so I tightened up the base plate best I could and ran it. The last few times I've run this engine,the vacuum floats from 8-12 in. with the rpm tracking the the vacuum, acted the same this time. Took off the carb and there was still fuel in the intake, maybe a little less. I took the carb base plate off and the base, body, and gasket were pretty much dry. Previously they were soaking wet. Far from a slam dunk, but it's worth pursuing. I think I will try to re-surface the body and get a new gasket.

GallopinGhost · 06-07-2019, 08:43 AM

Ok, I have finally found the real issue here. I did end up re-surfacing the bottom of the body and that is sealed up well. My original thought was to take out the power valve, I never tried that. So after looking at the baseplate, a lightbulb flickered on. First picture shows how I originally had it put together, second one is the fix.

Bobby DiDomenico · 06-07-2019, 09:52 AM

So changing from a 4 hole to a open plenum manifold gasket solved your issue?

GallopinGhost · 06-07-2019, 10:11 AM

It made a huge difference in the idle. from what I see, the first gasket blocked the source of manifold vacuum that feeds the PV. I think the PV was opening during idle. At least that is my new theory. Spark plugs are now dry as well.

Greg Reimer 7376 · 06-08-2019, 10:28 AM

Make sure you have some sort of 4 hole gasket or something else, like a 4 hole thin spacer, to keep a base plate to bowl screw from getting loose and backing out and falling into the engine through the intake! Holleys do that.Could save you an engine.

GallopinGhost · 06-08-2019, 09:09 PM

Thanks Greg. Good point. My theory #2 didn't pan out. Although I've seen fuel stains where there shouldn't be any, so trying a few things. Pretty annoyed with this carb as it's fresh from one of the name gurus, but I guess it's a good training experience for me.

06-07-2019, 08:43 AM	#3
GallopinGhost Member Join Date: Jun 2010 Location: VA Posts: 230 Likes: 23 Liked 21 Times in 13 Posts	Re: Fuel in intake Ok, I have finally found the real issue here. I did end up re-surfacing the bottom of the body and that is sealed up well. My original thought was to take out the power valve, I never tried that. So after looking at the baseplate, a lightbulb flickered on. First picture shows how I originally had it put together, second one is the fix. Attached Thumbnails __________________ Brian Carpenter Stock 1358

06-07-2019, 09:52 AM	#4
Bobby DiDomenico Senior Member Join Date: Jun 2002 Posts: 924 Likes: 103 Liked 101 Times in 52 Posts	Re: Fuel in intake So changing from a 4 hole to a open plenum manifold gasket solved your issue?

06-07-2019, 10:11 AM	#5
GallopinGhost Member Join Date: Jun 2010 Location: VA Posts: 230 Likes: 23 Liked 21 Times in 13 Posts	Re: Fuel in intake It made a huge difference in the idle. from what I see, the first gasket blocked the source of manifold vacuum that feeds the PV. I think the PV was opening during idle. At least that is my new theory. Spark plugs are now dry as well. __________________ Brian Carpenter Stock 1358

06-08-2019, 10:28 AM	#6
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,136 Likes: 172 Liked 705 Times in 219 Posts	Re: Fuel in intake Make sure you have some sort of 4 hole gasket or something else, like a 4 hole thin spacer, to keep a base plate to bowl screw from getting loose and backing out and falling into the engine through the intake! Holleys do that.Could save you an engine.

06-08-2019, 09:09 PM	#7
GallopinGhost Member Join Date: Jun 2010 Location: VA Posts: 230 Likes: 23 Liked 21 Times in 13 Posts	Re: Fuel in intake Thanks Greg. Good point. My theory #2 didn't pan out. Although I've seen fuel stains where there shouldn't be any, so trying a few things. Pretty annoyed with this carb as it's fresh from one of the name gurus, but I guess it's a good training experience for me. __________________ Brian Carpenter Stock 1358

05-31-2019, 05:44 PM	#2
GallopinGhost Member Join Date: Jun 2010 Location: VA Posts: 230 Likes: 23 Liked 21 Times in 13 Posts	Re: Fuel in intake Well I made some progress. The screws are #12, so I didn't have any of those, so I tightened up the base plate best I could and ran it. The last few times I've run this engine,the vacuum floats from 8-12 in. with the rpm tracking the the vacuum, acted the same this time. Took off the carb and there was still fuel in the intake, maybe a little less. I took the carb base plate off and the base, body, and gasket were pretty much dry. Previously they were soaking wet. Far from a slam dunk, but it's worth pursuing. I think I will try to re-surface the body and get a new gasket. __________________ Brian Carpenter Stock 1358