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Gas Tank Thoughts

I have new tanks so I could double the capacity of my fuel system but haven’t installed them because of the logistics. I think I get it now. But the process of studying out the problem shows that one diagram doesn’t tell the whole story. It rarely does. Series 1 tanks look different. Series 2 tanks and the aluminum after market ones I bought are slightly different also.

I diagrammed the plumbing before I knew which port was which. There is a fill inlet, a return inlet, and an outlet. If I add the second tank I want also to include the catch tank.

During this latest episode where I was trying to discover why my motor was acting like it had a vacuum leak even when there wasn’t one, I checked out the manifold and its gasket, the valve lash settings, and the fuel pump. For good measure I have a new fuel pump, new fuel lines, new inline filter, and even a new carburetor. Plus a new vacuum hose to the distributor.

A dispute arose among posters on line concerning the return line and that was when I discovered that the Tee adaptor that takes the output from the pump and shares it both with the carburetor and the  return line to the fuel tank has a special feature. The return line fork of the Tee is sealed then drilled with a 1/16″ hole. I checked mine and sure enough, it’s there. The type 65 pump has two outlets, one of which is specifically for the return line.

One poster claimed the return line plumbing was new to the Series 2 vehicles but shop manuals debunk the claim.

Here is how the fuel is routed. I’m considering making hard lines since the runs are so long.

Here are the differences between the old pumps and the later pumps. The brand new replacements at RD Enterprises look like the early pumps, except beefier. That is what delivers the fuel in my Type 54. My car varies from this diagram in that there is a straight pipe out the top which is plumbed to a Tee.

Here’s my take on the visual differences between early and later pumps, assuming my Type 54 and Type 65  cars have original pumps. Nothing is for sure with these cars, I’ve learned.

This is how I imagined I’d plumb dual tanks.

 

On my tanks, which are original, the outlet is located on the center of the side. This diagram assumes I’m using Steve Veris Aluminum tanks and a series 2 feul pump.

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