by Gipsy on Tue, 21 Jan 2020 5:13 +0000
There is a return line which sends excess fuel back to the tank but as far as I know no non-return valve. The common rail and ECU directs measured amount to the injectors and the excess is returned to the tank via a separate fuel line.
Why do you ask?
Cheers Gipsy
although I'm sure somebody will challenge that
even Einstein wasn't certain of his theories.
My 2013 auto D4D DC SR5, prefilter, 3" exhaust and Chip with egt probe, stock SR5 rims with Toyo Open Country AT2 265/65R/17's