carb problem motorcraft 2100
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Junior User
Joined: Sep 2007
Posts: 62
Likes: 1
From: Patterson, CA
carb problem motorcraft 2100
My stock 302 with a motorcraft 2100 two barrel is driving me crazy! It intermitently idles roughly and then dies. Today after it died in the driveway, I disconnected the fuel line into the carb and it sprayed a lot of presurrized fuel all over my engine. Way more presure than I've ever experienced with a mech pump/ carb engine.
The fuel filters (two of them) are new. Is this a float valve issue? The fuel pump is also new stock unit from Napa.
Any and all help appreciated .
The fuel filters (two of them) are new. Is this a float valve issue? The fuel pump is also new stock unit from Napa.
Any and all help appreciated .
Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
The only way to really see what kind of pressure you have is put a gauge on it. You should see no more than about 7 PSI max. That pump probably puts out in the 5-7 PSI range.
Could indeed be an intermittently sticking float valve...I would remove the top of the carb and check it, might be time for a little carb work.
Could indeed be an intermittently sticking float valve...I would remove the top of the carb and check it, might be time for a little carb work.
Fleet Mechanic
Joined: Aug 2007
Posts: 1,840
Likes: 263
From: Piney Woods of East Texas
When you actuate the throttle does the Accelerator pump squits fuel? in so I would not think it's an carb problem. My need to check you idle air/fuel adjustment.
Are you getting fire. It's possiable the spark control box is going out.
Are you getting fire. It's possiable the spark control box is going out.
Fleet Mechanic
Joined: Aug 2007
Posts: 1,840
Likes: 263
From: Piney Woods of East Texas
All depends if yours had been updated to electronic ignition & dist. Most of the time mounted on the passenger side inner finder. Other wise it could be a coil going bad, if you have fuel. Next time it happen, check to see if you have spark by pulling a plug wire at the distributer while you turn it over.
You could also have water in the gas. Open the top and see if you see any water in the bowl.
You could also have water in the gas. Open the top and see if you see any water in the bowl.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 790
From: Simi Valley, CA
2 barrel carb kit and related parts
D4AZ-9A586-A .. Carb Overhaul Kit (Motorcraft CT-499-D) Fits all: 1962/1974 2100 series 2 barrel carbs (car & truck).
The usual problem with the 2100 series of carbs is the POS accelerator pump diaphragm and check valve.
After a year or two, it's time to replace them both.
When these parts go bad, there's a hesitation when stepping on the gas pedal..the truck then bogs down and wants to die.
Both parts are located on the front of the carb behind a cover plate held on with 4 screws.
The cover plate has a lever on it. The two parts are included with the overhaul kit, but can be bought separately.
C4AZ-9B559-A .. Pump Diaphrgm (Motorcraft CM-463)
C4AZ-9576-A .. Check Valve (Motorcraft CM-825)
TAKE CARE WHEN REMOVING THAT COVER PLATE!!!
THERE'S A COIL SPRING BEHIND IT!!!
Remove that plate in a hurry...BOING....the coil spring flies out...it could land anywhere.
Usually what happens.....is....you end up stepping on the damned thing when searching for it!
The usual problem with the 2100 series of carbs is the POS accelerator pump diaphragm and check valve.
After a year or two, it's time to replace them both.
When these parts go bad, there's a hesitation when stepping on the gas pedal..the truck then bogs down and wants to die.
Both parts are located on the front of the carb behind a cover plate held on with 4 screws.
The cover plate has a lever on it. The two parts are included with the overhaul kit, but can be bought separately.
C4AZ-9B559-A .. Pump Diaphrgm (Motorcraft CM-463)
C4AZ-9576-A .. Check Valve (Motorcraft CM-825)
TAKE CARE WHEN REMOVING THAT COVER PLATE!!!THERE'S A COIL SPRING BEHIND IT!!!
Remove that plate in a hurry...BOING....the coil spring flies out...it could land anywhere.
Usually what happens.....is....you end up stepping on the damned thing when searching for it!
Last edited by NumberDummy; Jan 20, 2008 at 05:06 PM.
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
Originally Posted by WALFORD'S 56
N.D. sounds like you stepped on it 1 or twice!! LOL bILL
When one has 1 or more Basset Hounds, ya also gotta watch where you step!
Here, it's quadruple trouble.
Walking 'round the house at night with the lights off is not too smart.
Last edited by NumberDummy; Jan 20, 2008 at 05:31 PM.
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Thread Starter
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Junior User
Joined: Sep 2007
Posts: 62
Likes: 1
From: Patterson, CA
Thanks fellas, I bought the carb rebuild kit today. There was fuel in the float bowl and the accelerator pump seems fine, good strong squirt. Even if it's not a carb problem, I'm sure it could use a cleaning and freshening up.
The possible coil problem is interesting though. I put one of those electronic ignition Pertronix kits on it a couple of months back. But kept the stock old slightly leaky coil. What are the signs of a coil starting to go out?
The possible coil problem is interesting though. I put one of those electronic ignition Pertronix kits on it a couple of months back. But kept the stock old slightly leaky coil. What are the signs of a coil starting to go out?
Fleet Mechanic
Joined: Aug 2007
Posts: 1,840
Likes: 263
From: Piney Woods of East Texas
Those Pertronix units have know to go bad. There are quite a few cases on this forum. Failures within 90 days seam to be common. From what I have read if they make it past the 1 yr the seam to last for ever.
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