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Old 10-13-2022, 12:23 AM
Treozen Treozen is offline
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Join Date: Feb 2020
Posts: 37
Quote:
Originally Posted by Frank Reiner View Post
Consider this as a test:
1) Install a small ball valve in the return line downstream of the pressure regulator.
2) Install the pressure gauge.
3) With the aid of an assistant, simultaneously shut off the engine and close the valve.
4) Does the system hold pressure?

If yes, the regulator may be leaking.
If no, the check valve in the fuel pump may be leaking

I actually have a new regulator, so perhaps I should just install it. I bought it for my 300SEL but never got around to putting it in. If the check valve in the fuel pump is leaking, is that replaceable separate from the pump itself, and or can I simply install a stand alone check valve close to, but upstream of the pump?
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