fuel pump cross reference

Does any one know if a 1950 Style line Deluxe I6 dual diaphragm fuel pump fit and work on a 51 chieftain deluxe Straight 8? All help appreciated

If not, does anyone have a good working dual diaphragm fuel pump for a 51 chieftain

1950 Pontiac 6 and 8 used the same pump, #539. It's the same pump as a 51 8-cyl with Hydramatic up thru serial#P6UH5221, or with standard shift up thru serial# P6US18632; after those numbers a different pump, #9630, was used.

Ok that's a big help!! Thank you. Another ? Is, are there any chevy models that ran that same pump. Thank you again

No bids on this AC 539 http://www.ebay.com/itm/AC-539-fuel-pump-/231387074072

Re listed http://www.ebay.com/itm/AC-539-fuel-pump-/231407807074?vxp=mtr

Google AC 539 , Fuel Pump AC 539

Edit ("AC fuel pump 539" --> google is your friend)

https://www.collectorsautosupply.com/query.asp?make=PONTIAC&year=0&section=FUEL

http://www.ebay.com/itm/Pontiac-new-fuel-pump-kit-37-38-39-40-41-42-46-47-48-49-59-51-515-539-AC-/251635367068?pt=Vintage_Car_Truck_Parts_Accessories&hash=item3a96a2fc9c&vxp=mtr

Check out this ebay seller too.

GREAT work and if you have a good core he'll probably make an allowance for it.......

http://www.ebay.com/sch/crwautoparts/m.html?_nkw=&_armrs=1&_ipg=&_from=

Is, are there any chevy models that ran that same pump.

Just quickly browsing my vintage AC fuel pump catalog I see no other GM cars that used the #539 pump.

I have a bid on the ac#539 but the person will not respond to my messages asking if its NOS item and if the diaphragms are in like new condition. Any ways, I will keep you posted and again thank you all for your help. I'm sure I will be asking many many more questions in the near future.

With current gas/fuel formulations old stock diaphragms may not last

Needs to withstand ethanol mixes

Is there a additive that can be used?

Is there a additive that can be used?

No. The solution is to rebuild the pump with modern components compatible with today's ethanol-containing gasoline. Such kits are widely available, as are rebuilding services.

I'm sorry I'm a little new to this. What would be different other than the diaphragms? Aren't the new ones made of a paper component as well. I'm just trying to get a better understanding. I apologize

Primarily the diaphragms, possibly also the one-way check valves. Diaphragms are made of a fabric-reinforced polymer material, usually a synthetic rubber compatible with ethanol. Though not a part of the pump, you should also change the flexible fuel inlet line between the frame and the pump.

So basically if I'm going to run this pump I need to find a non ethanol gas station. .

Any NEW rebuild kit will have "the right stuff".

Don't even look at NOS stuff or you'll be back to square one.......and probably 20 miles away from home when it fails.

As mentioned above change other rubber components in the gas line.

The carburetor will probably be next.

Ok, well I won the bid on the #539 pump... so once I receive and install this I can eliminate failure by running only non ethanol gasoline. This will allow time to purchase and rebuild the one in failure. As long as I can get non-ethanol gas, I should be alright for a while correct? All of the gas lines have been replaced already.

As long as I can get non-ethanol gas, I should be alright for a while correct?

Not necessarily. If it's been rebuilt since the advent of today's gasoline it may be OK with any gasoline. If it has older internals compatible with non-ethanol gas it may not last long with that either if the diaphragms are old and age-deteriorated. Bit the bullet, take one pump or the other and have it rebuilt or do it yourself and be done with it.

I am going to rebuild one of them while the other is in use then rebuild the other once the rebuilt is in use