fuel pump check valve

[cliff]

what is it and what does it do? important stuff here as to understanding what heck might be going on...trying to help...cliff

 

[E30m42cab]

keeps fuel from backing up?

 

[cliff]

maintains fuel pressure upon shutdown, I suppose a matter of perspective in terminology. Prevents depressurization......

 

[cliff]

you do know, of course that fuel is returning back to the fuel tank constantly right?
endless loop, the injection system uses what it needs and returns the remainder back to the tank for reuse.....there is gasoline running both directions under your feet at all times when the engine is running....

 

[Doughnut]

you do know, of course that fuel is returning back to the fuel tank constantly right?
endless loop, the injection system uses what it needs and returns the remainder back to the tank for reuse.....there is gasoline running both directions under your feet at all times when the engine is running....

No, coolant runs in both directions under your feet at all times when the engine is running, it is the fuel that cools the engine and maintains battery charge.