Gents, i had a problem with my vacuum tank on my '27 President - the vacuum at high speed could not keep the vacuum tank filled with enough gas. I kept running out of gas and had to prime the vacuum tank each time. Once primed, the car ran fine. I never ran out of gas if I kept the car at speeds of 30 mph or so. I put a six volt pump at the rear gas tank and set the pressure of the pump at its minimum. I then put a small T in the gas line at the carburetor inlet with the line from the tank at the bottom of the T. I then filled the vacuum line from the manifold with solder to shut off the vacuum to the small gas tank and did the same with the line from the vacuum tank to the carb. By doin this, I bypassed the vacuum tank completely. The incoming line from the electric pump is painted black , and no one ever even sees it. I have never been stranded since. I know it is not authentic, but my President is on the road much more now than it was before the fix.