Carb help
Thread Starter
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Senior User
Joined: Jan 2008
Posts: 334
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From: Palatka, Florida
Carb help
The 93 in my sig just recently got a carb swap. I am using the 2100 motorcraft. Here is my problem the, when i turn my truck off , some how the carb is still dumping gas into the motor and filling my cylinders up. so the motor is hard to turn over until it pushes all the gas out. Any ideas on what to check on the carb. help is GREATLY appreciated.
O and by the way it is now showing no signs of flooding or running rich going down the road.
O and by the way it is now showing no signs of flooding or running rich going down the road.
Postmaster
Joined: Mar 2005
Posts: 2,949
Likes: 6
From: Earth
Are you using an electric fuel pump? I can't imagine a carb could dump enough gas to fill up the cylinders - and the needles/floats should stop the flow anyway. Are you seeing a bunch of raw gas being pushed out of the engine?
Try turning your timing back a few degrees, you may be firing the engine against the starter.
Try turning your timing back a few degrees, you may be firing the engine against the starter.
Thread Starter
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Senior User
Joined: Jan 2008
Posts: 334
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From: Palatka, Florida
Ya i have playd with the timing,if your are leaning over the front of the truck and turn the dizzy clockwise it makes harder to crank and then back it off (counter clockwise) it helps but still hard. If i put the pedal on the floor it definately helps alot. My fuel pressure regulator is set to 6.5 psi. I aint saying it is just flowing gas thru the carb in to the motor. I think for some reason it is drainin what is in the bowl.
But the real problem is basically it is hard to crank. I know it aint anything in starting system, (battery, starter, alternator,solenoid).
So it has to be something in the timing or else the cylinders are flooding, and as previosly described i have pretty much gotover thinking it is the timing. Unless any one else has any ideas.
But the real problem is basically it is hard to crank. I know it aint anything in starting system, (battery, starter, alternator,solenoid).
So it has to be something in the timing or else the cylinders are flooding, and as previosly described i have pretty much gotover thinking it is the timing. Unless any one else has any ideas.
Moderator
Joined: Jan 2001
Posts: 56,950
Likes: 2,718
From: Virginia
If the float level is too high, fuel will spill over into the engine and flood it. Either the float inside the carb is set too high, or your fuel pressure is a little high overcoming the float.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
Oh, I'm sorry, I was under the impression you were here asking for help!
Monkey see Monkey do, Until Monkey sees what Monkey does!
In case you are interested in FACTS, not what your buds think they know ...
Carburetor manufactures recommend 3 to 5 PSI ... Most recommend 3.5 PSI.
-Enjoy
fh : )_~
Monkey see Monkey do, Until Monkey sees what Monkey does!
In case you are interested in FACTS, not what your buds think they know ...
Carburetor manufactures recommend 3 to 5 PSI ... Most recommend 3.5 PSI.
-Enjoy
fh : )_~
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Senior User
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From: Palatka, Florida
i recently called holley and the tech guy told me no more then 7 psi, 6.5 average, and no less then 6.
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Moderator
Joined: Jan 2001
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From: Virginia
From what I understand, the fuel pressure can actually raise or lower the fuel level in the carb itself. Of course you can go too high and the needle won't seat at all, but I have heard on the holley's which are easily adjusted externally, you can get the level adjusted at a certain fuel pressure, and if you raise it a a couple of pounds, you actually have to go back and re-adjust the float levels again.
I am guessing this is because it requires more physical pressure from the float to push against the needle to hold the higher fuel pressure back. I bet this requires more fuel in the bowel to surrround the float, and that makes the level higher.
You know on these Motorcraft carbs, if you are a brave soul and don't drop any bolts into the intake, you can take the top off the carb with it still on the engine, and re-adjust the float level and then put the top back on. It works best if you have a fairly new gasket on top of the carb.
I am guessing this is because it requires more physical pressure from the float to push against the needle to hold the higher fuel pressure back. I bet this requires more fuel in the bowel to surrround the float, and that makes the level higher.
You know on these Motorcraft carbs, if you are a brave soul and don't drop any bolts into the intake, you can take the top off the carb with it still on the engine, and re-adjust the float level and then put the top back on. It works best if you have a fairly new gasket on top of the carb.
Thread Starter
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Senior User
Joined: Jan 2008
Posts: 334
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From: Palatka, Florida
Ya i was thinking about doing that with my motorcraft. But i went and picked up a holly yesterday and put it on today, and it still is doing it.
Remember my original thought that gas was filling up the cylinders and it was making my starter harder to turn. Well i figure if it is that problem and nothing with the ignition i will just unplug my duraspark 2 box and see if it still does it. So i unplugged my box and cranked the truck over and it didnt do it. It just turned over fine.
So i gas my original plan of it being fuel in the cylinders is out. But i have played with the full range of timing and not really much of a difference.
So i dont know, any suggestions?
Remember my original thought that gas was filling up the cylinders and it was making my starter harder to turn. Well i figure if it is that problem and nothing with the ignition i will just unplug my duraspark 2 box and see if it still does it. So i unplugged my box and cranked the truck over and it didnt do it. It just turned over fine.
So i gas my original plan of it being fuel in the cylinders is out. But i have played with the full range of timing and not really much of a difference.
So i dont know, any suggestions?
