Supply Line to Filter will NOT Quick Disconnect

[lars1]

I am asking for suggestions on how to free up the 1/2" quick disconnect fuel supply line to filter. It is stuck. Could it be a seal(s) and if so might lubrication such as WD-40 help? The return line disconnected correctly. It had sliding movement. I am using a "disconnect" tool from Lisle. Thanks in advance.

+++ 2003 GMC 2500 HD Duramax 175K Stock +++

1. Instrument cluster replaced with GM and then rebuilt by Module Master after the GM replacement failed.
2. Lower body corrosion fixed; bed liner applied on skirt.
3. Light "white" smoke during idle presumably unburned fuel. No increase in oil level obvious.

Overall a reliable truck. Good starter cold or hot. 18-mpg overall (75% Highway) lightly loaded. The injectors are the only disappointment. I hope to replace and have talked to Kennedy. I continue to be preplexed by the LB7 injector design / failure and the supposed filtration issues.

[More Power]

Originally Posted by lars1

I am asking for suggestions on how to free up the 1/2" quick disconnect fuel supply line to filter. It is stuck...

Is this fuel supply line quick-disconnect sorta near/beneath the brake booster?

[Kennedy]

Originally Posted by lars1

I am asking for suggestions on how to free up the 1/2" quick disconnect fuel supply line to filter. It is stuck. Could it be a seal(s) and if so might lubrication such as WD-40 help? The return line disconnected correctly. It had sliding movement. I am using a "disconnect" tool from Lisle. Thanks in advance.

+++ 2003 GMC 2500 HD Duramax 175K Stock +++

1. Instrument cluster replaced with GM and then rebuilt by Module Master after the GM replacement failed.
2. Lower body corrosion fixed; bed liner applied on skirt.
3. Light "white" smoke during idle presumably unburned fuel. No increase in oil level obvious.

Overall a reliable truck. Good starter cold or hot. 18-mpg overall (75% Highway) lightly loaded. The injectors are the only disappointment. I hope to replace and have talked to Kennedy. I continue to be preplexed by the LB7 injector design / failure and the supposed filtration issues.

Probably best to send a picture. There is no quick connect at the filter. Only at the LH side of engine near booster, under truck by fuel cooler, and at the tank sender itself.