Just picked this up and at first I thought it was an early fuel pressure pump. But it has 2 check balls, one for pulling in and one for pushing out. Now I'm thinking it could be for oil or maybe water for an early car? Any help??
Pressuring fuel tank with air. Would help on steep uphill grades but VERY dangerous!
Yes, pulling in air, and pushing out air.
Why is it VERY dangerous? You only need one or two psi?
I wonder too. Very common on speedsters
We had a '15 Cadillac for 24 years and it had the air on tank system from the factory as did several years after that. Hand pumped up a couple pounds,started it and a small pump on the engine kept the pressure up. Worked fine unless crud built up in the tank like might happen on any other vehicle. '15 also had a gear-driven tire pump on the top front of the engine.
Looking again at Duane's pump again,I think it's a primer pump for fuel,not air with the hard piping in and out and the valve.
Lots of cars use air pressure in the fuel tank. Just about any early race car up into the 50's used a hand air pump to provide fuel pressure.