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Old 08-05-2020, 07:01 PM   #21
4 Rivet Member
1986 34.5' Airstream 345
Londonderry , New Hampshire
Join Date: Mar 2017
Posts: 274
The problem is vapor lock and the return line design solves the problem
nicely. In the old days when your were sitting in a traffic jam on a
baking hot day you would often get vapor lock. This is when the
gas in the fuel line would get so hot that it would boil. The fuel
pump could not handle gasoline vapor so your engine would
stall. With a return line there was always cool fuel flowing through
the pump which eliminated the problem.
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