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southjk

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  1. Think I may have found the problem anyway...when I remove the vent tube and manually lift the check valve I can make the fuel transfer from the inner to the outter tank. I think maybe that weak vacuum due to a leak might not allow the proper amount of fuel in the inner tank to raise the float high enough to push up the vent check valve. I resolderd the fuel line into the banjo fitting thinking I may have a leak there. no help. I had new copper crush washers on the banjo connection but I observed fuel around that connection so I'm gonna replace the copper washers with the hard fiber washers and see if that helps the vacuum situation...

    Added the new washers and now how good seal at fuel connection. No change in performance ..must have vacuum leak somewhere.....

    Found another possible problem. I was checking the tank connection (rear main tank) and thought I'd resolder the tube going into the tank. I noticed the end of the tube had some crud in it.it wasn't totally obstructing flow but may have been clogging where the connection makes that bend at the banjo fitting. When the engine dies it probably fell back down..someone on the thread had mentioned this ...I'll let you know how it turns out.

  2. I do have all of the parts and an inner and outter tank. I checked the little flapper valve..theres not much that can go wrong with it. Everything is moving freely. Fuel is somehow being released when the engine dies. Suction is keeping the flapper closed I geuss. The valve that releases the vacuum must not be working right and allowing gas to flow from the in er to the outter tank. I actually sprayed penetrating oil over the valves and linkages just to make sure they were moving freely..then I sprayed with a solvent to remove the oil resisdue. Everything looks right but something is still wrong..thanks for the stewart pdf file.

  3. Well I've run out of things to try on the Stewrt vacuum pump and Marvel carb.

    Engine starts and runs fine until fuel is used up in float chamber. When engine dies the gas comes rushing back into the carb. I have completley disassembled the fuel system including the tank. I installed a glass filter so I could see if the fuel is being sucked from the tank and it does. I don't seem to have any vacuum leaks as I've used thread sealer on every connection.

  4. great photos. I think Ill do the same setup for a downtube air vent .Minne uses the port next to the vacuum connection. Having the visible fuel bowl inboard of the vacuum tank is a great idea. I think I saw a filter/bowl setup like that available at Tractor Supply.

    thanks

  5. I must have a leak somewhere..The connections are tight but must not seal. I've tried teflon tape but it seems to work out the threads. Maybe Ill try some thread compound. I hadn't thought about a air leak at the fuel supply coming into the vacuum tank but I've got new coper washer that came with a gasket kit.

    thanks

  6. I can pump gas into the fuel pump tank via an electric fuel pump.I have sinced bypassed the electric fuel pump because I thought that the vacuum wasnt strong enough to suck through hte electric fuel pump. but know change.I could have air leaks though.interesting that when I remove the top of the float bowl cover and observe the float as gas is consumed and float drops no gas enters the carb. then as the engine dies from starvation fuel enters the carb.

  7. <TABLE class=tborder2 id=post678128 cellSpacing=1 cellPadding=6 width="100%" align=center border=0><TBODY><TR vAlign=top><TD width=175>

    Join Date: Jul 2009

    Location: midland Texas

    Posts: 7

    </TD><TD class=alt3 id=td_post_678128><!-- google_ad_section_start -->1923 Buick Stewart Vacuum Fuel Pump<!-- google_ad_section_end -->

    <HR SIZE=1><!-- google_ad_section_start -->I have a fuel starvation problem in my 1923 Buick that uses a Stewart Vacuum fuel pump. I have replaced all gaskets abd throughly cleaned and installed new springs in the Fuel pump. I have completley dissabssembled the Marvel carb ,replaceed float and all new gaskets. Fuel tank has been completed refurbed with internal coating. I have been testing with the gas cap off as I though my problem was related to venting.

    Anyways.. I prime the fuel pump with a few cups of fuel. The car runs great for about 5 minutes then runs out of gas doesn't appear to be sucking gas from tank. Any suggestions?

    </TD></TR></TBODY></TABLE>

  8. I have a fuel starvation problem in my 1923 Buick that uses a Stewart Vacuum fuel pump. I have replaced all gaskets abd throughly cleaned and installed new springs in the Fuel pump. I have completley dissabssembled the Marvel carb ,replaceed float and all new gaskets. Fuel tank has been completed refurbed with internal coating. I have been testing with the gas cap off as I though my problem was related to venting.

    Anyways.. I prime the fuel pump with a few cups of fuel. The car runs great for about 5 minutes then runs out of gas doesn't appear to be sucking gas from tank. Any suggestions?

  9. well the carb is off along with the riser tube assembly. I realize know ..I think..that I could have removed the other screw that holds the little bracket that joins the carb body to the riser housing but I didn't see any way to get to it.

    The cork float looks in tact but very rough and maybe the source of my fuel starvation issue. Does anyone know if new ones are available for a 1923 Buick useing the Marvel 65 1 stamped on the body of the carb?

  10. I'm trying to remove the Marvel carb on my 23 Buick..Looked pretty simple but there seem to be a single small screw attaching the body of the carburator to the manifold that is not reachable by any technique I've found. Do you have to remove the entire manifold assembly to remove the carb?

    thanks

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