Does anyone know for sure if the fuel pump has a check valve?

 

The factory manual says there is an internal check ball in the fuel pump.

 

Thanks Rob. Is that the primary method of holding pressure in the fuel lines while the car is shut off?

Does this also mean that as long as the ball has a good seal, the fuel should not run back in the tank even if an injector is leaky or the regulator has a pin hole in the diaphragm? See where I'm going with this?

 

yes, in fact some hard start issues stem from the check valve leaking and all the pressure in the fuel lines going away. If an injector is leaking fuel will not run back in the tank, it will run into the cylinders (much worse) however a leaky FPR diaphram could cause fuel to run into the return line and back into the tank.

 

It won't run back to the tank, but pressure will still leak down if you have issues with injectors or regulator.

 

Ever since my Walbro 255 was installed by a local shop, the fuel system will not hold pressure if the engine is not running. Does the Walbro not have a check valve? Is the one from the stock pump supposed to be switch over? Someone on here said maybe the feed line was leaking, but I have always wondered about the check valve. Now that the car is not my daily anymore I plan on rectifing this. Can anyone elaborate on this?

 

It only makes sense then that any in-tank fuel pump have a check valve. If I were you, I would contact Walbro directly and ask them if their pump has a check valve. You could also ask Professor Overdrive at Summit via internet. The answer will come back in 24 hours. I would not think any manufacturer in their right mind would not incorporate a check valve so that you constantly have to crank and crank and then severely shorten the life of the starter. Even more so at high compression ratios.

 

Thanks for the reply. I will try Walbro first!