14-01-2016, 06:59 AM
Yeah, primary fuel circuit, covers most of the fuel components tbh. Considering the "black sand" you found in the lp pump housing and description of other symptoms, i'd be replacing that first if anything. Be best if you could find someone locally willing to temporarily swap parts to see if it fixes the problem, save spending out for something that may not solve the issue. Check the hp pump regulator is clean and clear too.