Fuel tank line access question Options

[stevegm]

EDIT:

I think I’ve found the problem. See the last post.

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I’m getting my engine broken in with a single carb. The fuel pump is located in the engine compartment. When I hook the carb up to the fuel line in the car, it doesn’t get fuel. The pump never quiets down, and no fuel.

When I put a fuel line from the fuel pump directly to a gas can next to the car, it takes fuel and runs fine. The pump quiets down once it gets fuel. Everything works fine.

When I blow air back through the fuel line from the engine compartment, with an air hose, you can hear it coming out in the gas tank. So I don’t think the lines are clogged.

Any ideas why I’m not getting fuel out of the main line with the pump? The line is a hard line. It looks like someone has replaced the plastic lines. The car had carbs when I bought it a few years ago.

[MJHanna]

Most fuel pumps are pusher pumps they like being close the fuel tank and push the fuel to the carbs. They have a tuff time pulling the fuel the entire length of the car. Also leaving it in the engine compartment it can vaper lock from the heat of the engine after it sits for a while. When you put it in the gas can it is a short distance and is pushing the fuel to the carb. Porsche moved the fuel pump to the front of the car to stop the issue of vaper lock.

[stevegm]

Most fuel pumps are pusher pumps they like being close the fuel tank and push the fuel to the carbs. They have a tuff time pulling the fuel the entire length of the car. Also leaving it in the engine compartment it can vaper lock from the heat of the engine after it sits for a while. When you put it in the gas can it is a short distance and is pushing the fuel to the carb. Porsche moved the fuel pump to the front of the car to stop the issue of vaper lock.

Thanks. I have dealt with vapor lock with other cars in the past. I’m just surprised this one won’t run at all with the pump. I was considering the possibility that I have a weak pump? If I decide to relocate the pump, can it be put under the car, above the front suspension bolt-on pan, and tie into the fuel line under the tank their? I’d rather not cut/drill to put it in the front trunk, and I don’t have a lot of time this week to do an in-depth installations.