stocki26

Hi Guys,

yesterday my wife and me were cruising with our 1953 olds 98, when stopping we smelled some fuel taste.

When checking I saw the fuel pump is leaking a little.

My Shop manual does not show the fuel pump so someone could make me happy to tell me how to and show me how the pump works inside

I would like to know all details before taking the pump out, I want to understand how it works before I take it out.

Thank you very much

Tedd Thompson

here is a link that will walk you through this project. Take pictures and make notes on the position of the valves, they can be reversed, a vice is handy and helps free up a hand....Tedd....

stocki26

thank you, the pump in my olds seems to be a little different one,but I am sure the vid will help

here you can see, where fuel was dropping out

fuelpump_zpsgvne0qyv.jpg

So I had to take some paper and mix it with glue and put it there to stop the dropping and to be able to drive home - it helped a little

stocki26

is there anyone that can tell me what number has to be on the carb to be the original one ?

I have found "MADE IN USA" and also a number on the carb, what number should it be for a 1953 Olds 98 ?

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Ozzie

I have much uncertainty trying to answer your question. Your words say carb but your pictures show the fuel pump. I am going to assume that you mean the pump.
There was a procedure to stamp the last 4 digits of the AC number on the flange of the pump. My Hollander interchange book shows 2 possible for 1953:
AC#1539294 1949-1954
AC#1539775 1952-Early 1954
It doesn't say what the differences were in the two pumps.

The part number shown in the Oldsmobile parts book is:
1949-1954 8-Cyl. 5591621

stocki26

pump - pump - pump

you are right, english isnt my mothers language so that things happen to me some times

thank you for your answer - but what you mean AC#

mine is a early 53, delivered in February

so this should be there ? AC#1539775 1952-Early 1954

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what I can read on that flange is 4529 ll

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and also AC MADE IN USA

Ozzie

As I said I have much uncertainty with my answer. AC was a part of General Motors which provided parts such as fuel pumps and spark plugs for the various cars made by General Motors. They assigned numbers to their parts. And, for the fuel pumps, the last 4 digits often was put on the flange of the pumps. If that is correct I would have expected to find 9294 or 9775. However, I see that your number does not correspond to numbers shown in my book. This makes me wonder if the book is correct. We may need to hear from an AC parts expert with an old AC catalog. I don't have one of those.

Ozzie

As I said I have much uncertainty with my answer. AC was a part of General Motors which provided parts such as fuel pumps and spark plugs for the various cars made by General Motors. They assigned numbers to their parts. And, for the fuel pumps, the last 4 digits often were put on the flange of the pumps. If that is correct I would have expected to find 9294 or 9775. However, I see that your number does not correspond to numbers shown in my book. This makes me wonder if the book is correct. Or perhaps there were revisions in the part numbers.(?) We may need to hear from an AC parts expert with an old AC catalog. I don't have one of those.

stocki26

I want to wish all of you a happy new year !


still working on my pump, had a break while christmas holiday but now it should work I hope

but there is (minimum) one more question LOL

what is that wire doing inside here (this is where the fuel dropped out earlier)

just a wire that was picked up and I can take out or does it have a function ?

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seems just to be a "U" of wire that was put inside there ?

I cant see any sense in that piece of wire ?

stocki26

seen from inside there are two small holes

but the wire isnt in the holes ?

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is it possible that there has been some filter earlier that was fixed with that wire ?

and maybe the two little holes are for not getting a vacuum inside the pump ?

Tedd Thompson

That port is where air inters the pump. Generally there is a pad of course steel wool in that hole used as a filter, probably the wire is there to hold the steel wool in.... Just a guess on my part... Tedd

Ozzie

It was used to retain a "clump" of a "hair" type filter which helped discourage "crud" from closing the vent holes in the pump and helped keep splashing water out. The wire is a "friction" type fit in the recess. It appears that the hair filter has deteriorated and has gone away. It can be easily replaced. You can see it in the attached drawing.

stocki26

hey - you guys are wonderful

where is that pic of the pump coming from ?

my manual doesnt show me that ..

stocki26

I just have seen there is a little spot that I maybe should show you ?

Do you think I should use that part or will it leak soon ?

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seems there is a very small triangle missing since production

Ozzie

Page 8-29 (or 255) of the engine section of the 1958 Oldsmobile Shop Manual.

Ozzie

Those look like the seals for the diaphragms' rods. If so, those could be a problem. The ones I've used in the past were continuous, without the gaps and fit the rods fairly snugly. If the seal doesn't work engine oil could accumulate in the diaphragm chamber. This would most likely happen on the fuel side due to the help from gravity. I'd probably try to find a better seal to use. (If the old seal is still supple you may want to re-use.) If you "must" use a questionable seal, put it on the vacuum side. In that location it would have the least chance to cause a problem.

Larry/car

My guess is your fuel pump diaphragm rod seals are bad. Suggest having your pump overhauled. Do a search, Rebuilding a 394 fuel pump. Not the same pump however the same internal mechanics are used. Will give you an idea what is involved.

stocki26

thank you, guys

since today my Olds is ready to drive

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stocki26

as everyone can see, it was not too early to rebuild the pump :-)

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thanks to Fusick that has sent the rubber parts very quick