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Posted By Discussion Topic: Fuel pump problem -- page: 1 2 3     TomO 07-25-2011 @ 7:10 AM reply profile send p.m. Senior Posts: 7386 Joined: Oct 2009 I have found that the rubberized cork seals work the best, followed by the all nitrile rubber and the least reliable is the all cork. Tom 37 Coupe 07-25-2011 @ 6:40 AM reply profile send p.m. Member Posts: 366 Joined: Oct 2009 It will be interesting to see what others have to say about cork or neoprene for the glass bowl seal but here is my take. You were able to correct some of the shrinking or swelling of the cork seal by tightening,I have also been able to do this but not with the neoprene or whatever rubber gasket is composed of,when the ethanol alcohol gets to it,it is useless.I have removed them after only a short time and they are sometimes soft and swelled up that they will not go back in to fit,and this is with a pump that supposedly has fuel proof diapraghm. What I am saying is you may be going the wrong way. I have had good luck with cork ones I think I got from KenCt,look like rubber is impregnated in them but they seem to hold up lots better than all rubber ones or still workable at least. Last one I removed to clean bowl did not want to go back in so I searched for about half an hour for spare one I knew I had,by the time I found it the cork/rubber one was back to size so put it back in. Get some spares and put them where you can find them,or someplace obvious like with spare fuel pump This message was edited by 37 Coupe on 7-25-11 @ 7:40 AM blarge 07-24-2011 @ 6:12 PM reply profile send p.m. Member Posts: 94 Joined: Oct 2009 My 47 Merc would not start after a 3 month period. I put a vacuum gauge on the inlet of the flex line and it showed about 1 inch of Hg when cranking the engine. I tightened the thumb screw on the glass bowl and it then pulled 10 inches of Hg on the cranking motor. The pump has a cork gasket on the glass bowl that is 2 years old. I am investigating if a neoprene rubber gasket would be better on the glass bowl. You should be able to hold 15 inches of vacuum applied to the inlet hole of the pump with a hand vacuum pump if the glass bowl gasket and the inlet check valve in the pump is OK. This a bench test and easy to tell if the suction side of the pump is working before you put it on. Test your pump and the loner pump to see it they are the same on this suction side bench test. Bill Large 37RAGTOPMAN 07-24-2011 @ 10:32 AM reply profile send p.m. Senior Posts: 1992 Joined: Oct 2009 fordmerc,did you try hooking up the fuel line from the back to the pump and try working the lever by hand to see if it pumps,? also have someone turn the engine over usings the starter, place yor finger on the top of the push rod,[ fuel pump removed,] and see if it has full movement, BEING the push rod was bent, I would make sure there is no damage to the push rod guide boss and bushing in the engine block,the slightest binding will cause the pump not to work, but you said the one you borrowed did work would rule this out, also make sure one of the fuel pump valves are in correct positions, I use THEN and NOW products and have great sucess with them, they also will rebuild the pump for you and test before sending out, also remember there are different fuel pumps makers and require the correct kit for them to work, THEN and NOW will ask you who made the pump so you get the correct kit, this may be a long shot,I think is is something simply and was overlooked. lets hear how you made out, 37 RAGTOPMAN ken ct. 07-24-2011 @ 1:27 AM reply profile send p.m. Senior Posts: 1513 Joined: Jan 2010 47 was the first yr for the glass bowl pumps.I have the correct off-set inlet + outlet pumps for the 39 yr.These are all steel pumps not GB one.These are rebuilt original pumps with modern diaf and valves if interested. ken ct. PM or email igadore@sbcglobal.net ford38v8 07-03-2011 @ 6:47 PM reply profile send p.m. Senior Posts: 2883 Joined: Oct 2009 Fordmerc, you earlier said that you assumed that the pump was original to your car. It was in fact first supplied on '48 Fords and Mercs, therefore not correct for your '39 Merc. If you are not concerned about originality, this pump should serve you well if the kit is installed as TomO instructed. Alan fordmerc 07-03-2011 @ 6:14 PM reply profile send p.m. New Member Posts: 180 Joined: Oct 2009 TomO: I did it wrong and opposite of what you describe; I'll try again 37Ragtopman: You can bend the fuel pump pushrod when you leave an unsecured engine in a trailer and go around a corner fast thus causing the engine to roll over. (During this maneuver, the fuel pump and tower had been removed to assure maximum damage to the protruding rod!) However, this was before the engine was rebuilt and the rod was replaced before the engine was installed. If the replacement rod is not made correctly, then it could be the problem, however, by measurement, it is correct. The rod moves up and down smoothly and vertically now. Car is 95 HP '39 Mercury (aluminum intake manifold). I attached (?) an image of my fuel pump on the right and one that works (from a '39 Ford) on the left. The one on the left works on my car, but it is not mine and must be returned to the owner. The difference is the angle of the pump arm lever, but everything taken alone looks fine - not bent, folded, stapled, or mutilated! Dolman 07-03-2011 @ 4:52 PM reply profile send p.m. New Member Posts: 177 Joined: Dec 2010 Thanks for the recommendation, Tom. I am irritated just enough to decline a replacement pump, ask for a refund and order from Speedway. But looking at the picture on the Speedway, is that a rusty rocker arm cup? I have enough of that substance without buying more. No rush now. July 4 is tomorrow and Old Henry will be conspicuous by his absence from the parade. (Am I the only guy that names his vehicles?) TomO 07-03-2011 @ 10:57 AM reply profile send p.m. Senior Posts: 7386 Joined: Oct 2009 I have had good luck with the Offenhauser pumps sold by Speedway Motors, and bad luck with the recent Airtex pumps. Tom Dolman 07-02-2011 @ 5:02 PM reply profile send p.m. New Member Posts: 177 Joined: Dec 2010 I thought so. The tank and fuel line are new and the engine ran fine with no sediment or rust in the inline fuel filter. I checked the new pump on the bench with a vacuum gauge while manually operating it...nearly dead. Looks like I got one of the defective pumps off the shelf. Well, it's in a box ready to return as soon as I get a RMA. Reminds me of my early Army days. Hurry up and wait.

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