michealbernal Posted March 13, 2019 Share Posted March 13, 2019 In bought a rebuild kit for my vacuum fuel system and installed it. I cleaned all the rust out of the tank and put it back together but it doesn't seem to be working. It is getting vacuum. This seems like a pretty simple system. How does one go about diagnosing what might be wrong with it? Any info appreciated. 1 Link to comment Share on other sites More sharing options...
Crazyfamily Posted March 14, 2019 Share Posted March 14, 2019 (edited) Did you test the Bakeilite Type flap at the bottom of the inner tank to make sure it holds tight under vacuum? Edited March 14, 2019 by Crazyfamily (see edit history) Link to comment Share on other sites More sharing options...
Crazyfamily Posted March 14, 2019 Share Posted March 14, 2019 I rebuilt mine and while I don’t have it installed back I the car yet, that will be this weekend 🤞🏼, but after talking to “Hal” at the Preservative Society who was most helpful and beyond a pleasure to talk with, he guided me to some do’s and don’ts on what to look out for with these SW Vacuum Fuel Pumps!! Hal instructed me to take the inner tank and while holding the flap shut momentarily on the bottom of the inner tank submerge it into a bucket of water or a deep Rubbermaid container just shy of the top of the inter tank and watch to see how much if any water seeps past the flap when you let go of the drain flapper, Hal said just a little seepage is ok but no more than a tiny bit! Then also drain the inner tank of water and then while holding the inner tank down into the water the same way in part one above, tank your mouth and chin and create a seal between the inner tank and your mouth/chin and while still holding the inner tank down into the water suck in with your mouth and see if it creates a vacuum when sucking in with your mouth, no water should come in at all when you are sucking!! Did you you try anything like this!? Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted March 14, 2019 Share Posted March 14, 2019 (edited) I have not thought a lot about how to test the vacuum tank once assembled. I did put together a vacuum tank rebuilding procedure if this helps you. I took some notes from William and added them at the end. Hugh Edited September 11, 2019 by Hubert_25-25 (see edit history) 1 Link to comment Share on other sites More sharing options...
Mark Shaw Posted March 14, 2019 Share Posted March 14, 2019 Good procedure Hugh. I have also used gas tank sealer on the underside of the pot metal lid to seal any cracks or porosity. Link to comment Share on other sites More sharing options...
Crazyfamily Posted March 14, 2019 Share Posted March 14, 2019 (edited) On March 14, 2019 at 10:25 AM, Mark Shaw said: Good procedure Hugh. I have also used gas tank sealer on the underside of the pot metal lid to seal any cracks or porosity. I used KBS Coatings Gold Standard Fuel Tank Liner to line both the inner and outer and keep corrosion to a min, i kept it away from where the inner tank meets the outer tank so no sealing issues and everything seems to work fine with reassembly. I didn't line the middle of the inner tank where the float goes into the bushing guide of the inner tank. Edited March 18, 2019 by Crazyfamily (see edit history) Link to comment Share on other sites More sharing options...
J.H.Boland Posted March 14, 2019 Share Posted March 14, 2019 On my '25 Buick the problem was with the big brass nut that holds the fuel outlet line on the top of the fuel tank.It seemed tight,but I installed a new gasket and the problem was solved.It was sucking air. Jim 1 Link to comment Share on other sites More sharing options...
michealbernal Posted March 14, 2019 Author Share Posted March 14, 2019 Hubert 25-25 and crazyfamily. Thank you so much for the diagnosis info. I would have never figured that out without your help. The bakealite valve on the bottom of the inner tank has a small chip out of one lower corner. I think that is at least part of the problem. Does anyone make a replacement for that valve or is there something that can be substituted? Thanks again for all the assistance. Mike 1 Link to comment Share on other sites More sharing options...
Crazyfamily Posted March 14, 2019 Share Posted March 14, 2019 40 minutes ago, michealbernal said: Hubert 25-25 and crazyfamily. Thank you so much for the diagnosis info. I would have never figured that out without your help. The bakealite valve on the bottom of the inner tank has a small chip out of one lower corner. I think that is at least part of the problem. Does anyone make a replacement for that valve or is there something that can be substituted? Thanks again for all the assistance. Mike Tell Hal I sent you, he recently helped me with my rebuild kit and all I can do is spread the word! He took about 5-6 phone calls from me and always called me back when he got back in!! Link to comment Share on other sites More sharing options...
Crazyfamily Posted March 14, 2019 Share Posted March 14, 2019 Www.classicpreservation.com the kit above doesn’t have the flapper in it, but it’s avail separately from him! Link to comment Share on other sites More sharing options...
Crazyfamily Posted March 14, 2019 Share Posted March 14, 2019 This is kit # VTK 101 for mine but like I said the flapper is avail separately! Link to comment Share on other sites More sharing options...
Crazyfamily Posted March 14, 2019 Share Posted March 14, 2019 Link to comment Share on other sites More sharing options...
Jim Bourque Posted March 15, 2019 Share Posted March 15, 2019 Hal is one of the good guys, he helped me with my Cadillac vacuume fuel pump. I highly recommend his products and service. Jim 1 Link to comment Share on other sites More sharing options...
Hubert_25-25 Posted March 15, 2019 Share Posted March 15, 2019 Mark and William, Thanks for the notes. I added them into the procedure. Hugh 1 Link to comment Share on other sites More sharing options...
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