Some of us, if not the most, do not like just replacing parts when they fail. We want to know, at least me, WHY they failed!

So, the big question is, why do the N18 engine HPFP fail? what is about the design that makes it fail?

I tried using N14 solenoid and it did NOT work. I noticed the openings are bigger on the N14 HPFP solenoid.

I three pumps that my R60 does not like and i also have an N14 HPFP that i can spare for this experiment.

any thoughts?