a crazzy dual fuel system

[DTanklage]

kinda wish you woulda made a chart before altering that tube

wot 2nd or 3rd gear

2000 rpm -

2300 -

2600

2900

3150

3300

[DTanklage]

ps - what did you change right before you lost 10 psi?

[Underpsi]

I was his gauge watcher and With the ksb off it doesn't really move much it was either like 65psi at idle or 160 wot. load on the engine doesn't seem to have any effect on the psi at all, its seems to be strickly rpm related. I got busy later and he punched his what I believe is the regulator and i took one second to go have a look. it was 200psi sitting at like 700rpm and he literally gave the pedal a tiny tap and it jumped instanly to 250psi with ksb still off

[cummins king]

dt = i changed the whole pump top, then i lost 10psi
hey kevin it was 185 under full load with ksb on but before i hit that thing

well when cruzing at like 50miles its at 100psi ish idle at 2300 and at 60miles, like 110psi at 2500rpm, them it went to 150 psi wide open 3200rpm

[JD730]

I managed to make a decent WOT run this morning from 70mph to 80mph before I had to back it off. Rpm range from 1800 to around 2100 rpms. Supposed to start snowing around noon today so that'll put the horsing around off for a while.

Started KSB off, pressure at 120psi cruising, went WOT and pressure dropped to 80psi, flipped KSB on and pressure jumped to 160psi.

Keep in mind my pressures are read from a modified return bolt, so I still have the return functioning on my pump. I have to get my camera back and take some pictures of it.

[KTA]

I would expect that with stock injectors your case pressure should vary proportional to RPM's. I think with bigger injectors and more fuel is when you start to see like what JD730 is seeing where case pressure drops with increased load. I think running the pump with no return is a bad idea, and doing it with the pressur jacked up is even worse. The injection pumps are sensitive to heat, and that is a good way to overheat one in my opinion.

[DTanklage]

dt = i changed the whole pump top, then i lost 10psi

you went from a afc lever removed top to that 'thing' you have now (which i am guessing is ag top?) and lost boost?

i wonder if the pivot points are different in the ag top???

[JD730]

That looks like the stock pump top with the AFC portion of it removed on a milling machine. I personally don't like the idea because I want to have a functional AFC setup to cut some of the low end fueling down. I still drive and have done some towing with this rig.

I agree with KTA, the fuel return was put in for a reason.

[DTanklage]

kta does not have a return on his system

[JD730]

kta does not have a return on his system

Does he drive his everyday?

[cummins king]

before i lost the 10 pounds of boost i had the afc leaver removed, i still can hook the return back up, im ogoing to trie this and see if it makes a difrence, but what do you guys think of the 250psi my pumps putting out,
oh and about cutting the afc portion off it the best way to have dule feed, i have half inch right into the pump, and i still can have key shot off and a return line, if i ever want to put a afc lever in i ould just go to my pump guy and get one for 20 bucks

[seeker1056]

hey cummins king - I be only 1 hour 40 or so from Oakville
Care to get together one o these days n collaborate on a few things


I dont think anyone really knows just what KTA has for a system ;o)

I would not in the least be surprised to find out that what we envision from his tidbits and what he actually has is very very different - thats why he is the current top dog in the hp race

[DTanklage]

ask him what he has

i did

and i have no reason to believe he is lying or keeping secrets

a-1000 putting 60 psi to vane pump with 14mm head and huge injectors

oh, and a couple of big turbos...

[DTanklage]

ps cummins - i am pretty sure the check valve is closed on your 1/2" line

all the time

unless you have a 200 psi pump infront of it?

[Underpsi]

he doesn't have a half inch line going to it yet. Just has it all ready for when he gets the electric fuel pump and lines in