Okay the long story. Last July 4 weekend fuel pressure went to 0 between La Junta Co. and Taos NM. Hope I did not screwup the VP! :{ Change to my spare FP in Taos pressure back up to 14 idle, around 13 cruise and 10 WOT. 3 weeks ago fuel pressure got erratic. :{ Be cruising along 13 psi then all of a sudden pressure drop to 9 even done to 6 sometimes and stay for awhile then jump back up to 13 no change in engine sound or performance.
Installed Vulcan big line pump relocation kit yesterday and pressure went to 15 idle around 14 cruise and 12 WOT. Pressue rock solid until I had to slow and turn on a road at the bottom of a grade. Accelerating up the hill, the pressure jumped down then back up to 12 then down again 3 times(a short hill) after topping out it went to rock solid 13 psi cruise.
What do you think OEM fuel pump from Cummins I installed last July, electric Autometer gauge sending unit, something else? By the way what does everyone use for a mechanical pressure gauge for testing pressure.
I have another pump on order but won't have it before my trip to Vegas this weekend. Hope that does not turn out to be a mistake. I need to cure this problem before towing my 14,000# 5er to Phoenix for the NASCAR race in April. Oo.
Thanks for any help.
Installed Vulcan big line pump relocation kit yesterday and pressure went to 15 idle around 14 cruise and 12 WOT. Pressue rock solid until I had to slow and turn on a road at the bottom of a grade. Accelerating up the hill, the pressure jumped down then back up to 12 then down again 3 times(a short hill) after topping out it went to rock solid 13 psi cruise.

What do you think OEM fuel pump from Cummins I installed last July, electric Autometer gauge sending unit, something else? By the way what does everyone use for a mechanical pressure gauge for testing pressure.

Thanks for any help.