I have asked this before, and didn't get an answer that pointed me to a source. Well, the thing popped again, so I am in need again. I made a little fuel pump for my insane yard tractor rebuild some years ago. I used some misc. rubber material for the diaphragm, and it holds for about2 years, then starts to leak. I bought some stuff specifically sold for this purpose, with some cord sandwiched between Neoprene. it is really too stiff for the little motor, and it only lasts a couple months before is breaks up at the cors and starts leaking. Grumble! So, does anyone know of a source for a good pump diaphragm material that can take continuous exposure to auto gasoline, and is still pretty flexible? I might have to buy some cheap mechanical pump and take the diaphragm out of it, or find a tiny commercial fuel pump that I can use.
I don't need a lot of head pressure, this needs to lift the gas no more than one foot, and deliver maybe 2 GPM if it was on all the time.
OK, here's the whole scoop (I ought to put pictures on my web site.) It is a 1968-vintage Bolens tractor with a 12 Hp Wisconsin engine. It had this hideous little updraft carb that was poorly made to start with, and in worse condition, with no parts available. I had a Honda motorcycle carb laying around, and jury-rigged it, and it worked great. But, it needed the gas delivered higher than for the updraft carb. So, I put a little header tank above the carb, and put a float switch in the header tank to turn on the pump when the tank was low. This all works fine, except for the pump diaphragm.
Thanks in advance if anyone can point me to a source of a good diaphragm material.