Quote:
Originally Posted by bluelectron
I disconnected the fuel return line and connected it to an external container for recycling the gas.
System pressure 78psi, about the same as the previous test with the return line connected to the cars’s tank. This tell me the return line is not blocked.
Now here is the twist.
The cold control is 0.5 bar or 7 psi. The cold control pressure was 3.9 bar or 57 psi. I don’t understand how the control pressure can change so much. I will do additional test again tomorrow with the return line connected back to the tank.
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Blue,
The cold control is 7 psi. with the return line disconnected and goes up to 57 psi. when connected, as per your test. This simply indicates flow restriction some where along the fuel return line going back to the gas tank. This is the reason why you need to test the complete return line to locate the culprit. There are several connections in the return line, either test the line/s using compressed air or fluid to locate it.
You have a partially blocked return line. To demonstrate how the restriction affects your old control fuel pressure is gradually closing the valve to 70%~80% closed and you will replicate your problem.
Tony