I was not aware of the WD-40 thing.:humm: Thats good to know........

Non stick cooking spray is easy on a diesel as well.

Sorrywhen I said loosen them I should have said to jut crack them loose so the line is still thight on its nozzle seat. This will allow the pressureto build to the point of unseatting the poppet inside the nozzle but not enough to open the return. So if you have a hard spray you have a stuck injector nozzle. At least thats the way I have always checked them and when I found one spraing hard and sent it to be rebuilt they would tell me it was stuck and if you get no fuel keep loosening the line untell you do then you know its stuck open. All nozzle's will dribble when tested this way.you only loosen them just off their torque lock to start with.

I never heard of using cooking spray? as a starting aid.

Afraid I still can't accept what you are saying,the flow is miniscule from the IP and any place for liquid to escape is going to be less pressure than poping the injector.

The pop pressure for a 6.5td is over 2100psi,and over 1750psi for a non turbo,as soon as any fuel leaks past the line/nut there is no chance to unseat the poppet in my mind.

Afraid I still can't accept what you are saying,the flow is miniscule from the IP and any place for liquid to escape is going to be less pressure than poping the injector.

The pop pressure for a 6.5td is over 2100psi,and over 1750psi for a non turbo,as soon as any fuel leaks past the line/nut there is no chance to unset the poppet in my mind.