fuel pump pressure loss.

[1dollardog]

I have noticed that my fuel pump loses pressure after it sits for a while. Not sure how long but it has to sit atleast 15 minutes. Noticed it the other day after I shut it off with the hood up, I went inside for a little while and when I came outside I noticed it had zero fuel pressure. Is this normal or does it supposed to hold pressure?

 

[turbobuick1]

It's more or less normal, the pressure normally bleeds down through either the check valve built into the fuel pump or the fuel pressure regulator after a while. I wouldn't worry about it, but when you get the time it might be a good idea to verify that you have the correct fuel pressure at idle and that the fuel pressure rises in proportion to the boost pressure.

But, like I said, the pressure bleeding down after 15 minutes or so is normal.

 

[1dollardog]

It's more or less normal, the pressure normally bleeds down through either the check valve built into the fuel pump or the fuel pressure regulator after a while. I wouldn't worry about it, but when you get the time it might be a good idea to verify that you have the correct fuel pressure at idle and that the fuel pressure rises in proportion to the boost pressure.

But, like I said, the pressure bleeding down after 15 minutes or so is normal.

Thanks. I think the car still has the stock pump. If I recall it hangs at around 40+- psi at idle with vac hose on and I have the slightly upgraded "237" non-adjustable regulator.