Weber/Carter Accelerator pump differences

DWinTX

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Joined
Jul 16, 2011
Messages
8
Hey guys, I have a 93 4.3LX with the Weber 4bbl. I was converting it from a stove choke to an electric and decided to go ahead and rebuild it while I had it out. I bought a kit, but also noticed that there was a marine-spec accelerator pump available. This is it (about 1/2 way down the page, part # cu 1471:

http://www.carburetion.com/Carter4.htm

The pics I attached show 3 pumps. The one on the left is the cu 1471, the middle is the one that was in the carb, and the one on the right is the one that came in the kit. Since the kit is a Carter kit, I assume the one in there is automotive, but the one in the carb now is the same except for the color of the rubber, which is probably just discolored from being soaked in gas for years. But the marine pump has a metal shaft, and the base is differently shaped. Was the carb rebuilt before with an automotive kit? It wasn't running too badly, maybe a little rough, but not a big deal. Should I go ahead and use the cu 1471?

This is my first build of a Carter-style carb, done a couple of Holleys and an Autolite or two. Never build a marine carb before.

Thanks.
 

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DWinTX

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Joined
Jul 16, 2011
Messages
8
Re: Weber/Carter Accelerator pump differences

I guess no one's familiar with this, but can someone at least tell me if they have ever opened up an original Weber 4bbl from the early/mid 90's? Was the accelerator pump shaft plastic, or metal?
 

John_S

Rear Admiral
Joined
Jun 21, 2004
Messages
4,269
Re: Weber/Carter Accelerator pump differences

My guess is that it was rebuilt with an auto kit. From memory, I had a mid 90's merc 750 cfm, and believe the accel pump rod was metal. I think my current 1409 is too.
 

DWinTX

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Joined
Jul 16, 2011
Messages
8
Re: Weber/Carter Accelerator pump differences

OK, thanks John. I'll use the metal one.
 
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