Reply to "Webber Fuel Regulator"

I'm using two pumps. A Holley mechanical and a Holley electric.

The Pantera-Electronics Ignition controller ramps the electric pump to vary the pressure as required by the engine.

As a result the pump is not on all of the time.

The pump has a built in pressure relief valve also. This is the low pressure (red) pump set at a 4 psi limit.

The pressure gauge is plumed 1/2 way into the system.

I haven't had any problems with pressure, fuel delivery or any issues as is.

I'm just investigating the pros and cons of adding the return line to the tank since it is so easy to do in this car.

I don't have any plumbing of the tank vent check valve and presuurizing of the tank via a return line to the tank may be creating an issue of fuel fumes in the engine compartment from it and in a Pantera could be a very bad idea.

My fuel filler is the outside neck type not the early filler inside of the engine compartment.

I was just looking for feedback on what Tennessee Tims fuel plumbing design does.

His remarks and his claim that he needed it to keep the carbs from boiling over indicate other issues with his installation that he has not dealt with correctly from what I know about these systems and I have never seen anything like it or the need for the return line in the thirty years that I have been dealing with Weber carbs.

Looks like he is the only one to have done this?

One additional thought on the rise in fuel pressure after shutting down the engine hot, is that the floats in the IDAs are the old style brass ones.

As of yet, I have not had a Weber float colapse, but I have had that on Holley carbs. They Holley carbs should be converted to the sold nitro fill floats to eliminate that possibility.

That would be a good idea on the Webers too but those floats so far have been elusive at best. It is something that I need to do to have confidence in driving the car on 1500 mile jaunts. Webers definitely make you paranoid about absolutely everything. Worrying about what you might have missed is always there, but then I have had SO MANY issues with Holleys I worry about them also.

I suppose the end result is the return line is a trivial detail, but one that could come back and bite you...and lethally too?