Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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My 37 Master came with an AC 85V40151 Fuel Pump installed.
Is anyone familiar with this pump that could tell me more about it?
Since it wasn't originally installed on a 37 216 engine, what years were they produced?
Any idea if the input or output can be adjusted by turning with a wrench?
If I was looking for another, what model and year AC would I be asking for?

Thanks

Terry
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Your vehicle came with an AC fuel pump type number 429. It would have been the kind of pump that was screwed together and would have had a glass bowl on top. I will attach a picture. They are available and you can find them on Ebay and then rebuild it yourself with a kit or send it to someone in that business. Filling Station sells the kits. Then and Now Automotive would be my contact it you wanted an AC already to go. AC made a switched from the screw together type to the design you have. No adjustment. I could not find the number you have in a quick look but will check my shop books tomorrow.

The painted pump on the left is the AC 429

Dave

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Last edited by Dave39MD; 12/06/22 09:21 PM.
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If I remember correctly that pump came out in the late '60's or early '70's.
There were no adjustments or repairs and by that time owners just replaced the pump ....actually by 1950 no one bothered to repair pumps .
and they were a bettr pump.

Last edited by Chev Nut; 12/06/22 11:29 PM.

Gene Schneider
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It would a bit of a letdown if the fuel pump on the 37 is from the 1970s. Even the 50's would be better.

I found that attached photos on eBay for sale of a 35K40151 that looks like my 85V40151 . . . . their description is "Dated: 1971 . . . My catalogs from '62, and '76 do not list this pump. It might have been a limited run and was merged with another similar pump number."

My 40151 has been working fine but I'm in the process of changing the carb from a Rochester B series to a Carter W-1 and I was hoping to avoid changing multiple things at the same time. I may have to reconsider changing to the AC429 to avoid bending the new fuel line to suit a 40151 when the 429 is more suitable for the age of the car.

Terry
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Just so you know the part or type number on your pump is 40151. I believe the other numbers are some sort of date or manufacturing code.

Dave

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The glass bowl pumps disappeared in the '70s and 80s. If you bought a replacement pump then, you got one without a sediment bowl. Rebuilding was unheard of. The sediment bowl pumps and repair kits came back with chevsof40s and TFS. I still use the AC type pump for driving as is it is much more durable. I put the glass bowl one on for car shows.


Mike
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I could not find that number in any books. Normally you would add a 64 to that number and get the manufacturer number but it does not show up. In any event Mike is right the AC Univac (not screwed together) type pump that you have was a very good pump. AC did supply a Univac 429 which could be what you have. I have been running the 429 with a glass bowl for about 50 years on my 39 and have had to put a diaphragm or two in it but it has been a very good pump.

Your call

Dave

Last edited by Dave39MD; 12/07/22 11:13 AM.
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Thanks everyone. As usual, all very useful information.
Since my best efforts are to keep my car a weekly driver, maybe I won't rush to replace the current pump.

Terry

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I will agree with that iagree

Last edited by Chev Nut; 12/07/22 11:59 AM.

Gene Schneider
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I have several used ones . If you want one to rebuild . Email me if interested bwbugay@aol.com

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My '46 came with a pump that looks the same as Terry's pump.

I have several NOS AC 429 pumps in original boxes that I planned on rebuilding with new diaphrams (I tried one and they need them) and installing one on the truck for originality and reliability.

After reading this thread, I'm changing my plans.

I think I'll just get kits for all of the NOS pumps, rebuild one to have on hand, and leave the pump on the truck alone as long as it isn't giving trouble.

The kits I see available all look slightly different from each other.
Any opinions on who supplies the best kit?


Ole S Olson
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Dave - You are very fortunate with your rebuilds. I only rebuilt my original pump once. About 10000 miles after the rebuild it started leaking oil out of the casting around the pump lever pin. I think Gene once mentioned he had the same problem. When you run at 65 to 75 on CA freeways your fan does a wonderful job of distributing the oil to every nook and cranny in the engine compartment. Also, I was amazed at how much oil can leak out around that pin. I was down a little over a quart after 40 miles. Once was enough, so I just stick with the newer design pump. My car is a Senior and has been since 2002 so I know the importance of originality.


Mike
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Yes the oil keeps the rust and dust down! My car is HPOCF so I keep the old style on. I am baffled by not being able to find the OPs part number. AC made NAPA pumps for a time in the eighties and they had some numbers not in the ACDelco line, might be one of those.

Dave


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