OK, stupid question.

I just got my hose techniques hose kit. Which size hose should I use for all the solenoids?

3.5 with the thicker walls (40 feet) or the 4.0 (only 15 ft). They both seem to fit equally well.

TIA

 

Use the 3.5, the 4.0 hose is for a boost gauge. There should be a piece of paper with the kit telling what each size hose is intended for.