Fuel Tank Connections

[smokedpig]

After several weekends of wrestling with sediment in my carburetor's float bowl I decided it was time to clean out my fuel tank and lines. Peeking inside the tank is in good shape but there is some debris in there. This is a plus, a good cleaning and I should be back in business.

But hang-on, not so fast. Like all projects while pulling the tank I noticed another issue. There are a multitude of hoses protruding from the tank that the PO capped off. Looking at the diagram below the capped lines are (3) Fuel Separation Lines and (1) Fuel Return Line.

I am concerned that these capped lines in conjunction with a non-vented gas cap have created a closed system and will ultimately lead to vapor lock.

Q: Will these capped lines interfere with fuel delivery or create any other problems? If so, what should I do about it?

 

[smokedpig]

After several weekends of wrestling with sediment in my carburetor's float bowl I decided it was time to clean out my fuel tank and lines. Peeking inside the tank is in good shape but there is some debris in there. This is a plus, a good cleaning and I should be back in business.

But hang-on, not so fast. Like all projects while pulling the tank I noticed another issue. There are a multitude of hoses protruding from the tank that the PO capped off. Looking at the diagram below the capped lines are (3) Fuel Separation Lines and (1) Fuel Return Line.

I am concerned that these capped lines in conjunction with a non-vented gas cap have created a closed system and will ultimately lead to vapor lock.

Q: Will these capped lines interfere with fuel delivery or create any other problems? If so, what should I do about it?

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I found the answer in a response from @73FJ40 in this post:

Fuel line routing at tank

My 1972 FJ40 tank rusted out. I got a great deal on a new Toyota fuel tank but for newer models. To verify my searches, my question is the supply line is now the pipe on the bottom and the return is the side where my original supply was? And the three small lines on top are all emission related...

forum.ih8mud.com

A: Cap off the extra tank lines and add a vented gas cap (or drill holes in your existing cap) to prevent vapor lock.

 

[smokedpig]

I found the answer in a response from @73FJ40 in this post:

Fuel line routing at tank

My 1972 FJ40 tank rusted out. I got a great deal on a new Toyota fuel tank but for newer models. To verify my searches, my question is the supply line is now the pipe on the bottom and the return is the side where my original supply was? And the three small lines on top are all emission related...

forum.ih8mud.com

A: Cap off the extra tank lines and add a vented gas cap (or drill holes in your existing cap) to prevent vapor lock.

Another response here:

1976 FJ40 Missing Fuel Separator

What sort of concerns should I have given the PO removed the fuel separator on my 76? Should this go to the top of my repair list, are the parts available, etc?

forum.ih8mud.com