I was digging through a pile of Model T parts at my parent's farm this weekend and spied some un-T parts buried in the dirt. I cleaned up this fuel pump but was unable to find a manufacturer or model number for it. Do any of you guys have any information on it? Thanks.
Looks like a old 55 chevy 265 V8 fuel pump.
I think you are on the right track, but it doesn't exactly look like the examples I found on e-bay. It must be a GM product.
Having sold over 3000 NOS fuel pumps in the past, i can say it is an amazing thing that every one is different in some way to another. They were made from about 1932 until the late 70's , and are generally not worth much in even NOS condition. Even NOS ones generally need rebuilt before use. I sold all my parts books, when i finally sold the last fuel pump. There should be some numbers on it somewhere to identify, and possibly an old parts store could help identify, if you find an oldster willing to look it up. good luck !
Can't say what it fits but usually on the mounting flange is a stamped number that can be used to identify it, especially if it is an AC brand pump. I'd place it in the late 1940's or early 1950's as it is a double action pump having 2 diaphragms. The smaller one is for pumping gas while the larger is a vacuum pump for the windshield wipers.
There is an AC stamped into it. When I get home tonight from work, I will post the numbers. What does "AC" stand for?
That has a vacuum booster for windshield wiper assistance when going up a hill under a load. These were used before electric wipers came into vogue.
Really resembles a marine pump with two diaphragms, and a leakage accumulator (glass bowl) to prevent fuel leakage into the bilge. Usually a tap off the accumulator to the carb intake to burn excess from the indicator, but some will remain in the bowl as a witness that its leaking. ws
Wrong arm for sb ch##y. I'm guessing oddball as in not big 3.
A/C stands for Albert Champion of spark plug fame, was later called acflint then ac delco as we know it today, a division of general motors.
Chevy trucks and pickups used AC dual diaphragm pumps and vacuum wipers until at least 1954.
It looks like an AC model AB Combination pump, but would
depend on the actual part number to determine what it fits.
Probable certain 1935 and newer Buick, Cadillac and the less
mainstream engines like Hudson and La Salle etc.
Models AD, AL, F, I and J were similar, and the shape of the rocker
arm, and the mounting bolt pattern etc. was a deternining factor.
The serial number stamped on the fuel bowl portion is 855261. Next to the AC look to be room for two numbers stamped in a circle. The first number, if there was one, is gone; the second one looks to be a "9."
You found it! Awesome! Thanks!
Apparently that # is the same on many different pumps fitting many different models. Check on the mounting flange again for another number stamped into the flange, that will be the model number.
I worked as a counterman for years and that number only identifies the top of MANY fuel pumps, the flange number is the only way to nail down what this fits
It doesn't fit a '55 Chevy or newer of that I'm quite sure,altho it does have a similar mounting flange and bowl.
In the first picture, what is the rectangle shaped opening near the top.....breather?
Number 855261 is what is called a factory number and can often be referenced to a AC number. I have looked at my books and cannot cross to and AC number. I have books that go back to the early
30's to late 70's. There may be a 4 or 5 digit number also.
There's "net talk" that the pump was used on a 31 Chevy too. As already mentioned, the pump could fit a large range of makes and models.
Have you been able to find the numbers stamped on the flange? If no numbers can be found, my experience says it may be a rebuilt pump sold by aftermarkets like Wizzard. In many cases they attached a metal tag to a screw with their number on it that does not correspond to any AC number. Sometimes the aftermarket people used a dye stamp on the body that would wear off and not be readable.
There is another number stamped into the housing where the brass arm sticks out. That number is #1523641. The #855261 is stamped on the top of the fuel bowl cover.
1523234—NASH-LAFAYETTE, MODEL 3710 (1937)—OPTIONAL EQUIP.
1523641—NASH-LAFAYETTE, 3810 (1938), 3910 (1939)—OPTL.
1523238—NASH AMBASSADOR SIX, MODEL 3720 (1937)—OPTIONAL.
1523643—NASH AMBASSADOR SIX, 3820 ('38), 3920 C39)—OPTL.
1523236—NASH AMBASSADOR EIGHT, MODEL 3780 (1937)—OPTIONAL.
1523644—NASH AMBASSADOR EIGHT, 3880 ('38), 3980 ('39)
1522228—STUDEBAKER, MODELS 7A, 8A (1938)—OPTIONAL
TYPE:—This pump similar to Type X fuel and vacuum pump except that Top Cover
for fuel pump section is Type B.
PERFORMANCE:—See article on Fuel Pump Testing for test procedure.
Capacity—1 Pt. in 1 minute. (Min.). Pressure—3y2 lbs. maximum.
SERVICING:—Follow instructions given for Type X except for top cover assembly
(see Type B for valve and cover section of fuel pump).
R. S. Cruickshank is right, my old memory had completely forgotten the rebuilders markings and how when they are gone you could only rely on visual identification.
From the 1941 Motor’s Factory Shop Manual
It’s a AC model # AD and fits the following . . .
1935 Nash and Lafayette model 3810
1940 Nash and Lafayette model 4010
Hmmm - I guess that should have read 1938 model 3810.
I wonder how many of these part numbers changed by simply rotating the top or bottom housing a bolt hole or so?.
Art, a lot of the pumps are the same except for the rotation, (based on the input/output lines) and the arm. I have been into the pumps for over 20 years and got to the point of only selling at Hershey. I have further reached a point of retiring from the game. I have done very well with the pumps over the years and have bought them to keep the inventory active. I had a fire in my motor home last year and sooted up my inventory sheets and some of my manuals but all are usable. I want to sell all of my inventory of approx. 2500 at core price of $7.00 per. All of the pumps are new or rebuilt but about 1/3 would need to be rebuilt again. They cover from the early 30's to late 70's. I have them sorted by AC number and crossed to AC number if it is not an AC part. They are all in plastic crates with lids except for the extra inventory that I have kept on the shelf for fill in when necessary. The pumps themselves are mostly in boxes but some are loose and numbered. I will take them to Hershey again this year but would like to sell out to someone who wants to make expenses for the week at Hershey and maybe someone who wants to play the EBAY game.