I have a 1953 low pressure 235 in a big bolt truck. It has a Rochester "B" Carb and a double action fuel pump. I have had the fuel pump rebuilt by a well known shop in California, who for now shall remain nameless. I received the rebuilt unit back. Everything bolted up with no problem.
Fired up the truck and within 10 seconds was running, and in another 10 seconds, fuel was leaking from the accelerator pump linkage area of the carb flooding the engine and dousing the manifolds with raw fuel. I even had fuel spraying out of the air bleed. Pulled carb off and inspected needle and seat for wear. Saw nothing to suggest that was a problem. Checked the float setting and drop and all was well. Checked the float to make sure the float wasn't leaking or saturated. All good there too. Reassembled everything and fired her up again. Still flooded like crazy. Removed carb, took to a friend of mine's shop and he rebuilt carb, and went so far as to hook an electric fuel pump to carb while on the bench to verify proper sealing operation of needle and seat. All was well on the bench. Put rebuilt carb back on truck and still flooded and leaked all over. Then got a hold of a vac/ fuel pump guage and tee'd that into the carb. Fired truck up and wham! Within seconds, that fuel pump pegged the guage hard at 10 psi. Problem found. Called the pump rebuilder, and at first they said, send pump back and they would look at it. Seems fair to me. Then I received a call back from the rebuilder saying, that there was basically nothing they could do, because there is no internal adjustment in the pump that can regulate fuel pressure. The suggestion was made to put a regulator in the line to solve the carb flooding issue. I say no. The real question here is why is that pump putting out at least twice the recommended pressure? The fuel system in my truck never had a regulator installed, even when I used an electric pump. I have put a video on YouTube so you can check out what I'm writing about. It's about a minute and a half long. Here's the link:
