[dicklague]

I am not an expert in this scoping fuel pump area, but it appears to be a routine trouble shooting step on cars with electronic fuel injection.

I am not debating whether it is useful or not. It seems to be an accepted trouble shooting test for fuel injection electric pumps.



We have 4 Saab Aeros in our family and I check into Saab sites such as SaabNet often. In-tank fuel pumps fail in these cars as well as most cars with EFI. When pump does go it may just leave you in a tough spot on the side of the road. Some people replace pumps as a precaution on a mileage basis.

A contributor on Saabnet who owns a great Saab/Volvo indy shop talks about scoping pumps all the time.

I did some internet research and it is a very common and popular test.

I am surprised that I have not seen it much here and thought I would introduce this here.

To me it is a great test to know if your pump is suspect or ready to go out.

I just test the pump on my wife's Aero on Sunday and the pattern looked great, so I feel confident that her pump is healthy.

My 1990 Chevy off-road truck did not look so good when tested yesterday.....not bad, but not great. I have to look into this one.

Hopefully a Porsche guy who has used this test will chime.