ramsport59

I just installed a Reman VP44 on my 2001 CTD from Midwest Fuel Injection. It runs great, But occasional I get a Extended Crank Time. It might do it once a day, none at all or 75% of the time. I check all my lines, they are tight. Installed the new return line check valve, still actted up. So what would be my next step to look at?

Thanks!
Rick