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Joined: Oct 2004
Posts: 535
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Oct 2004
Posts: 535 |
My 1950 4 door with 216 has an AC 9803 combination fuel and vacuum pump that I bought new 29 years ago. It has always seeped a little oil, but now at speeds above an idle it sprays oil onto the inner fender sheet metal! From earlier postings I get the idea that replacing it with a new unit is the only certain cure because of known issues with the pivot pin and the casting. This unit seems to be available only under the Airtex and Carquest brands. What do you think?
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
I am sure I would eplace it with a new one.
Gene Schneider
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Joined: Jan 2008
Posts: 828 Likes: 6
ChatMaster - 750
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ChatMaster - 750
Joined: Jan 2008
Posts: 828 Likes: 6 |
If the pivot pin has workout on one side it will hit the bolt and stop, may be able to tap it back in and stake it and use some sealer on the ends. If it is leaking out of the hole on the side the seal that keeps the oil off the diaphragm is bad and like gene said it will need replaced.
Dens Chevys 1927 Speedster 1928 coupe 1941street rod 1947Fleetline 4 door 1949 1/2 ton Pickup (sold) 1954 210 4 door 1972 Monte Carlo 2003 Corvette convt..
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Joined: Oct 2004
Posts: 535
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Oct 2004
Posts: 535 |
It is spraying out of the rectangular opening at the top of the side away from the block, nearest the inner fender, where the manual indicates the vacuum air intake filter is, so I will take ChevyGene's advice and replace the whole unit with a new one.
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Joined: Jan 2009
Posts: 341 Likes: 3
Backyard Mechanic
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Backyard Mechanic
Joined: Jan 2009
Posts: 341 Likes: 3 |
Hi Chevy50jim
As I rebuild old fuel pumps, what happened with your fuel pump is the oil seal for the vacuum side diaphragm pull rod probably tore up allowing oil to be sucked in when the diaphragm relaxes then pushing it out the vent (square hole in the side). I can rebuild your old pump for $135.00 as this is what I charge for a dual diaphragm pump. You can probably get a new aftermarket one cheaper.
If interested, e-mail me at bob@marxparts.com
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Joined: Oct 2004
Posts: 535
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Oct 2004
Posts: 535 |
Thank you for your expertise and advice! So far I have not found any new ones online and COTF and FS are out of stock.
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Joined: Jan 2002
Posts: 1,069 Likes: 9
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Jan 2002
Posts: 1,069 Likes: 9 |
1946 Chevy 3100 1/2 Ton Pickup Purchased 11/18/17 Sold 9/20
1948 Chevy Fleetmaster Coupe, Purchased 6/20/2010
1965 Chevy ll 350 Purchased Feb 2021. 3-speed Saginaw Hurst Floor Shifter 3.08 Rear End
2019 Ford Ranger Lariat Super Crew
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Joined: Oct 2004
Posts: 535
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Oct 2004
Posts: 535 |
Yes, Napa is out of stock too.
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Joined: Nov 2002
Posts: 7,472 Likes: 26
ChatMaster - 7,000
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ChatMaster - 7,000
Joined: Nov 2002
Posts: 7,472 Likes: 26 |
You might try Doyle Stokes 478-922-3605 I got my single action 51 pump from him a couple of years ago.
Steve D
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Joined: Dec 2009
Posts: 1,072
ChatMaster - 1,000
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ChatMaster - 1,000
Joined: Dec 2009
Posts: 1,072 |
there is a new one on ebay right now item number 152269378034 1950 chevy fuel pump with the tag 9803 by it now 125 bucks
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Joined: Oct 2004
Posts: 535
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Oct 2004
Posts: 535 |
Found another new one on ebay for $35, so ordered it with a 1 year warranty. Other suppliers had them for $60 to $100 but were out of stock.
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Joined: Oct 2004
Posts: 535
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Oct 2004
Posts: 535 |
After a 20 mile test drive, the new pump is pumping out oil too! Glad I bought the eBay 1 year warranty.
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Joined: Jan 2005
Posts: 3
Grease Monkey
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Grease Monkey
Joined: Jan 2005
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Seems to me, if I remember right, oil flying out of the fuel pump vent hole is a symptom of another problem. The vent hole in the pump is there to help the pump diaphram move smoothly. This vent is also a direct passage to the crankcase. If you have cylinder blow-by that can be caused from piston rings being poor or a damaged piston you get a buildup of crankcase pressure and one of the places this pressure come out is the fuel pump vent hole. This pressure carries a lot of oil with it. When the engine s fully warmed up take a close look at couple other chankcase outlets to see if there is excessive pressure comming out when you add some RPMs. A couple good places to check it is the rocker cover oil filler/ vent opening and also the road draft tube below the engine. Also check the oil filler cap to see if the screen in it is clogged as that will also cause that dreaded excess crankcase pressure..... Thinking here. That road draft tupecan also become cloged but it is rare but if it does clog and the oil filler cap on the rocker cover also is cloged the oil will fly out of the fuel pump vent
Last edited by old pirate; 11/13/16 09:03 PM.
piracy is good
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Joined: Oct 2004
Posts: 535
Oil Can Mechanic
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OP
Oil Can Mechanic
Joined: Oct 2004
Posts: 535 |
Thank you for all the advice! I will check out all those possibilities.
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