I know this is a dumb question, on an 02 cummins 5 speed, everything under the hood is stock except for the lift-pump, which is a fass lift-pump, and reading and knowing fuel pressure is everything, how would a big line kit help?

It would be less restriction and that is good for the lift pump as it isn't going to work as hard.  It will also add volume which could decrease heat at the VP44 and allow for better cooling and lubrication.

Big line kit will allow for more flow at a given psi.  

 

Flow is king, PSI is only restriction in a system.

A big line kit is good.  A draw straw is way overrated in my opinion and creates less usable fuel in the tank.

I love my draw straw, I can run down well below 1/16 of a tank without any PSI issues.

I love my draw straw, I can run down well below 1/16 of a tank without any PSI issues.

 

That is good, and you must have done your install right, a lot of guys seem to have issues... Especially on hills.  How much clearance between the tank and the straw?

Next to none.The straw is also angled so as to allow for feed room even if the straw is all the way on the bottom.

A big line kit is good.  A draw straw is way overrated in my opinion and creates less usable fuel in the tank.

Agreed, Id rather run through the stock pick up without having fuel level issues.

You have to consider that you can really only move as much fuel as the most restrictive part of the system will allow. Take a breath through a drinking straw. Now tape a piece of 1/2" hose to the straw and see if it's any easier to breath.

Thanks for the replys, now my next question would you go 1/2 in or 3/8 in?

1/2 all the way. Might as well get the most out of the flow with the least amount of restriction.

Thank you

I had a draw straw in my tank when I bought my truck, but had problems sucking air with 1/3 of tank or less so i modified my module to have 1/2" lines in and out. I got it to about 1/16 of tank and worked good. I think if you use needle valve for fuel pressure gauge it dampens the signal too much and you can't tell if you're sucking air at low fuel level, but if you crack it open more just to try it out. I'm thinking you'll see maybe needle bounce. You can  see I drilled another hole on top of module and used jic fitting to a flare on inside, and using stock plastic return line from injectors and vp, Also make sure to get rid of fine screen on bottom of fuel basket, I don't explain well so hope this helps. P.S. make sure to run return pretty close to bottom or it will make lots of foam. 

Edited October 10, 201510 yr by Dieselfuture

I'm also a draw straw user too. I can run down to below 1/8 of a tank without much issues. It about doing the measurements while the tank is empty and making them tight to the bottom. Like myself I measured for a quarter coin thickness. Reason why is when you add fuel to the tank the bottom will deflect away so it will add gap naturally and also draw near the tip as it empties. No angle cut. Also I just lightly notched tip with a grinder. Draw Straws are fine as long as you install them properly.

 

I had a draw straw in my tank when I bought my truck, but had problems sucking air with 1/3 of tank or less so i modified my module to have 1/2" lines in and out. I got it to about 1/16 of tank and worked good. I think if you use needle valve for fuel pressure gauge it dampens the signal too much and you can't tell if you're sucking air at low fuel level, but if you crack it open more just to try it out. I'm thinking you'll see maybe needle bounce. You can  see I drilled another hole on top of module and used jic fitting to a flare on inside, and using stock plastic return line from injectors and vp, Also make sure to get rid of fine screen on bottom of fuel basket, I don't explain well so hope this helps. P.S. make sure to run return pretty close to bottom or it will make lots of foam. 

Mine is set up very much like yours. Same fuel basket but with an ADII. I dont have whatever the aluminum thing is you have in the pump bracket. My pickup just goes into the bottom of the basket. My return from the engine goes into the basket and I cant remember where the return from pump the goes. I also did not remove the screen but the pump will suck the tank dry. I Have been one to run a tank real low. So low that I have put a touch over 35 gallons in it once and near 35 gallons less than a hand full of times. I dont recommend stretching your fuel that far, It is a bad habit I have had for a long time. Never sucked air in that I know off anyway.

Edited October 10, 201510 yr by dripley

Mine is set up very much like yours. Same fuel basket but with an ADII. I dont have whatever the aluminum thing is you have in the pump bracket. My pickup just goes into the bottom of the basket. My return from the engine goes into the basket and I cant remember where the return from pump the goes. I also did not remove the screen but the pump will suck the tank dry. I Have been one to run a tank real low. So low that I have put a touch over 35 gallons in it once and near 35 gallons less than a hand full of times. I dont recommend stretching your fuel that far, It is a bad habit I have had for a long time. Never sucked air in that I know off anyway.

That thing is draw straw 5 http://www.vulcanperformance.com/DrawStraw-5-p/ds5qc.htm it replaces factory in tank pump. And then I made my own return. And that white stuff on top of module is jb weld fuel compatible for more strength.

Edited October 10, 201510 yr by Dieselfuture

That thing is draw straw 5 http://www.vulcanperformance.com/DrawStraw-5-p/ds5qc.htm it replaces factory in tank pump. And then I made my own return. And that white stuff on top of module is jb weld fuel compatible for more strength.

I understand now. my AD came with a kit to replace the in tank pump also. More or less a pick up tube as I remember that went to the bottom of the basket. Very simple but works very good.

I had a draw straw in my tank when I bought my truck, but had problems sucking air with 1/3 of tank or less so i modified my module to have 1/2" lines in and out. I got it to about 1/16 of tank and worked good. I think if you use needle valve for fuel pressure gauge it dampens the signal too much and you can't tell if you're sucking air at low fuel level, but if you crack it open more just to try it out. I'm thinking you'll see maybe needle bounce. You can  see I drilled another hole on top of module and used jic fitting to a flare on inside, and using stock plastic return line from injectors and vp, Also make sure to get rid of fine screen on bottom of fuel basket, I don't explain well so hope this helps. P.S. make sure to run return pretty close to bottom or it will make lots of foam. 

Dang! That's the cleanest tank top I've ever seen!

 I Have been one to run a tank real low. So low that I have put a touch over 35 gallons in it once and near 35 gallons less than a hand full of times.

  So you know what the   looks like. Your crazy man, I've never had to put more than 34 in mine

I've even seen that numerous times after the draw straw install.

 

Just in how you install the tube.

  So you know what the   looks like. Your crazy man, I've never had to put more than 34 in mine

My scan gauge blocks it and with my hearing I dont hear the chime. But i know my fuel gauge and I reset my trip meter every fill up. The light comes on at 1/8 tank like mike's pic and I have 3 gallons left. I dont push it as much as I used to but I am still guilty of pushing it.