Here's my story... You can't swing a dead cat on any cummins forum without hearing about fuel pressure to the dreaded vp44, I get it and after much reading understand the pay a little now or a lot later situation. So After installing a fuel pressure gauge (discovered importance from same forums) I was appalled to find out I had 8psi at idle and approaching 0psi at wot... Son of a.... Ok clam down, what's the next step? Swap out the lift pump, dooh it's in the tank and who likes dropping a fuel tank. I've reading endlessly about airdog etc pumps and think that's what I need but what about my pump being in the tank... And damn they're expensive. So here's what I did and the rational I used. Did a bunch of reading and turns out the plastic membrane in the vp44 that's tears is because of low pressure not high pressure (supports what I want to do so I continue). Now what about pulling fuel through the crappy in tank pump? Will it burn out a a new pump plumbed In Series.... Well I've read multiple times that the vp can still run, for a short time with a dead lift pump, umm so therefore a pump plumbed in series could also pull fuel through said weak pump ( again supported my end goal so continued). I installed a factory replacement pump on the side of the block (in place of dummy block installed by dodge ) in series with the weak in tank pump and here's the results, 22psi at idle and 15psi at wot. I'm happy and if what I read is true this set up should be fairly robust and I like the fact that if one pump of the other goes out I still have a back up to get home on....

I've got a drawstraw in my 96, and I've ran it down to where I put 34 gallons in it...so depending on the install, you can get it to set right. I did on my 97, however, use the pureflow module modification, where it uses the return line in the basket as the intake line, and plumbs a new return line to the basket. Never had an issue with that one either, and the cuts weren't nearly as critical to get right.

My little AD 100 has 3/8" line ran to the connection at the top of the tank. 18 Psi with 2 to 3 psi drop under heavy load. I don't have the pressure drop that other people claim.

This is what I did too but I still seem to have a drop of about 4-6psi between idle and wot. I have the raptor 100 though.

That's all mine is as well, a Raptor motor that I bolted onto an AD100 (they are the exact same motors)No I didn't just put a sticker on an AD :wink:3/8" line from top of tank to pump,1/2" line from lp to fuel canister and vp. I would have ran 3/8 the whole way but 1/2" was only a few bucks more.Even when I had my Raptor block mounted I generally saw a 2 to 3 psi drop under hard aacceleration,. maybe 4 psi under the heaviest loads and Heavy acceleration.

Thx for the above info boys. Although the DS seams "better" this a work truck with no high hp goals.What I want to do is replace the intank pump with a length of hose thereby retaining the factory sending unit. Is this possible?

that is essentially the same thing as the vulcan drawstraw, and vulcan's would look more professional and probably leak less http://9gbx7.hpqh3.servertrust.com/category-s/220.htm