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I removed the S-shaped hose at the fuel pump of my 78 PC, with the intention of replacing it. I expected to lose a certain amount of fuel in the process. I drained well over a quart of fuel in a minute or so.
By the force of the stream, it appears it was siphoning from the tank. How did I do this without draining the tank.
Work faster. Leave the tank side of the hose on the line barb and use a vise grip in the middle of the hose to stop the flow. Attach new hose to the pump side and secure with clamp. Remove the tank side of the old hose and quickly attach the new hose. Done.
I use a set of needle nose vice-grips to clamp the rubber fuel line coming out of the tank. I slip a rubber hose on each of the jaws of the vice-grip so as not to cut into the fuel tank hose. Use only an LED drop light. Jerry
Hey Bob, just a thought: if the hose you were working on was lower than the pickup in the tank, and the fuel line was full of fuel when you started, it was siphoning.
If you question was 'how do I do this without draining the tank' (your post said 'How did I do this without draining the tank.', so I wasn't sure if you were asking why it seemed to be siphoning), follow Stingr69's advice above - that'll work. Best, Paul