Engine/Transmission (1998.5 - 2002) I have an intank LP and low PSI, what should i do??

[PizziLLA]

Ive been running the mopar in-tank pump for a while now, but it just is not enough.



a while ago, i bought a holley blue with the pressure regulator, yet i havent installed it. my hesitation is with the difference in pressure between a pusher pump giving about 6 PSI idle, and a puller pump(if it was done in series) that is pulling quite a bit more(around 15 PSI).



with having that differential between the two pumps if they were done in line, would that not bother the in tank pump by having the holley pump wanting to pull more fluid than it can supply??



my other option is to drop the tank again, get the draw straw, and run the holley pump in parallel with the in tank pump, so that the different pressures arent interfering with eachother until you get further down the line where the pressures even themselves out??





thoughts??

 

[Doug1810]

the holley does not want 15 psi it wants so many gph so if the pusher can supply that many gph you should be ok . i run a 7 psi carter in a 15 psi carter bolth 100gph

 

[fox]

i changed out enough of the carter pumps to feel they are not reliable on a diesel.

I switched to the Glacier pump and find it VERY capable.

18 psi at idle and NEVER below 16, even at WOT!

 

[Doug1810]

the stock carter lp or just all carter lp? about how long do they last ?

 

[steved]

I would not hesistate to place the Holley behind the intank pump. The holley is designed to pull fuel without an added "helper". The intank pump will allow fuel to pass by it if it fails, so it should allow the Holley to pull fuel past it if the demand of the Holley overcomes the capability of the intank pump.



And IIRC, the intank pump will provide enough volume to the VP44, just not at the pressures we want to see... so if the volume is good, then ramping it up to 15psi should pose no issues (if the volume stays the same).



And at the same time, by adding the Holley to the system, you are effectively reducing the "head" the in-tank pump sees, and therefore it should actually be able to flow more volume to the Holley at less head.



steved

 

[Chief USA]

You might take a look at this item. Completely bypasses fuel pickup of the in tank pump.



http://www.vulcanperformance.com/servlet/the-143/Vulcan-%3Ci%3EDraw-Straw-II%E2%84%A2/Detail

 

[PizziLLA]

sweet, the biggest thing i was worrying about was smoking the in-tank by putting that other force on it, but hadnt really thought about the GPH factor!





chief, that was my next idea; with the draw straw, i could also run the 2 pumps parallel of eachother, without them interefering.







i think ill slap that pump on my framerail now, and see what happens!

 

[mhenon]

sweet, the biggest thing i was worrying about was smoking the in-tank by putting that other force on it, but hadnt really thought about the GPH factor!





chief, that was my next idea; with the draw straw, i could also run the 2 pumps parallel of eachother, without them interefering.







i think ill slap that pump on my framerail now, and see what happens!

I've been running the Carter along with the in-tank. The two pumps put out 26psi and had to install a bypass to keep the pressure under 15psi. So far it's been doing a good job and the pressure doesn't fluctuate much (12 to 14. 5psi) regardless of the load.

The in-tank is able to put out a lot of fuel but has it's own internal bypass that keeps the pressure at 8psi. There's no way the Carter will suck it dry. Also. . having a head of pressure at the inlet to the Carter might (I said might) keep it alive. Since DC had already installed the in-tank pump, along with a new VP44, I thought I'ed work with it. I like having a low pressure/high volume pusher in front of the Carter.

Mike

 

[JMiltier]

Is the FASS pumps any good?

 

[GCULP]

Is the FASS pumps any good?

OH YEAH! after four pumps, I went with the Vulcan Draw Straw and a FASS 150, 20 to 21 p. s. i. at idle and 18 p. s. i. at full pull, and it's quieter, (quieter, is that a word?)

 

[JFulford]

I've had an intank lp since Dodge replaced the external under warranty(6 months). My previous lp was fluctuating between 8 and 14 psi. I now am running right at 6 psi, but will drop to 0 on WOT or close to it. This has bothered me but it seems to be par for the course with the mopar intank pumps.
2002, 275RV, 5" exhaust, 47RE, 4. 10s, Smarty.
jeff

 

[jeepit]

You might take a look at this item. Completely bypasses fuel pickup of the in tank pump.



http://www.vulcanperformance.com/servlet/the-143/Vulcan-%3Ci%3EDraw-Straw-II%E2%84%A2/Detail

Ok, help me here. Do you disconnect the intank and run the draw straw or are you running both? I don't get it?

 

[JMiltier]

yea pretty sure you run the just the draw straw but i may be wrong maybe someone with chime in and make for certain

 

[PizziLLA]

I've had an intank lp since Dodge replaced the external under warranty(6 months). My previous lp was fluctuating between 8 and 14 psi. I now am running right at 6 psi, but will drop to 0 on WOT or close to it. This has bothered me but it seems to be par for the course with the mopar intank pumps.
2002, 275RV, 5" exhaust, 47RE, 4. 10s, Smarty.
jeff

yea thats what im scared of, im still running stock sticks, all i need is to put some 1. 6's on it, and then im sucking the VP dry!!!

 

[PizziLLA]

Ok, help me here. Do you disconnect the intank and run the draw straw or are you running both? I don't get it?

with the draw straw II, the pickup is mounted on the new tank pump unit, so that it draws after the internal filter. at that point, you use both an aftermarket pump, and the intank pump on two seperate lines, then connect them with a y or t connecter after the secondary pump. (theyre running in parallel)

 

[RTolbert]

I ran into the same problem w/my '01 w/the in tank pump. I added a Carter 4600 series (7 psi) pump in the original lift pump location and replaced the plastic supply line with a 7/16 in. supply line and now I run 16 psi at idle and no lower than 13 psi at WOT and that was pulling an 11,000 lb fiver. I have had no problems with that set-up since I installed it in May 2006.

 

[RAndrae]

Easy, drop tank remove in tank junk throw in trash get fass, air dog/ draw straw- done. I have been running fuel preperator 60,000 mi +, no problems.

 

[jeepit]

Easy, drop tank remove in tank junk throw in trash get fass, air dog/ draw straw- done. I have been running fuel preperator 60,000 mi +, no problems.

Do I need the original canister/fuel sender or does Draw Straw come with that?

 

[RAndrae]

You will need the orig sending unit, If you dont have one a dealer should have dozens of old ones around.

 

[PizziLLA]

if i had known about fass 2 years ago, i would not have this issue right now... . but some peoples situation is a little different!!



dodge does most in tank retros as warranty work, since they dont do the original LP's anymore



i asked a dealership what i should do when i first bought the truck, and thats what they gave me... . almost 3 bills later!! im not hardly going to pull my tank and throw away that pump now!!