Question about i/p

[Stumped]

Wondering if anyone here knows about the regulator cams on the side of the i/p.Gathering up my spare i/p's and happened to notice that the cams that operate the bypass regulator are different profiles,and since the DB2's use fuel pressure to regulate timing adv,is there a little performance to be found there.The 4911 i/p cam( orig i/p off my L65 motor,j code non emissions) is far different than the others,most of which are 6.2 pumps.

[Stumped]

Turns out that the cams are different profiles for different amounts of timing.I compared both turbo i/ps to the non turbo and a little reading says that the turbo cam allows for less timing than the 6.2 cams.I wondered why the old 6.5 ran so much better with the 6.2 pump(which is off a 1 ton 2wd cab and chassis,j code)

[Oldsmoke]

Looks like you've stumped most of the members with this thread:) Can't we just wait for someone to develop a common rail fuel injection system for our trucks?

Seriously tho, the money they want for a reman pump these days is outrageous and if I had a spare one laying around a little exploratory surgery would be tempting.

[Stumped]

My 6.5 ran ok,but got to where it wouldnt start hot(I was told dist head going bad ?) I went thru my pile of i/ps and found one with reman stickers and popped it in there.I could not believe the difference.Most of my exp. was with 6.2's and this 6.5 came alive(which had me suspect a truck I sold last yr just needed a pump) I have scanned the net looking for details of operation on these pumps without much luck.If you look at the top of the i/p,you will see an arm running down to the bypass.That arm has a roller on it and follows the contour of the cam,operating the bypass regulator.I fine tune electronic equipment all day,its nice to work on something mechanical for a change.

[Stumped]

That cam rests where the TPS switch is for the trans(right under the tps)

[Stumped]

I bought a 97 1 ton swr a few yrs back.Stopped at dealership to buy serv manual.Their diesel mech asked me if it ran good.I replied yes,like a top.His reply was sell it now.It freaked me out and I did.My brother has put 150,000 miles on it since!I decided to stick with 92-3s with no electronics so to speak(just trans control) and have accumulated a lg pile of parts,i/ps ect.So its not big $$ to fool with them.I got that 6.2 pump for free on a frozen and busted 6.2 (DONT USE THE ROUND HOLE WHEN INSTALLING I/P in the drive gear!) It will make you cuss and have the neighbors looking at you funny and not let their kids play in your yard anymore.