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Engine/Transmission (1998.5 - 2002) CAN I RUN 2 CARTERS LP`s AT ONCE?

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HI just wondering if it would be a good idea to have 2 carter pumps running at once. both are worn down some puttin out apx 6lbs. if i combined the 2 would i then get 12 lbs? is that too much? i guess i`d have to put one way valves on both pumps and thier own suck tube to the tank . has anyone done this to have both running at once? thanks
 
12 lbs is definitely not too much--lots of us are running 14 to 16 psi with aftermarket pumps like the FASS or Airdog. Some are running even more than that, but generally you don't want to go much higher than 18.

I don't really know if you'd get 12 psi by combining the two like you mention, but I doubt it. Personally I'd ditch them both and spend the money on a decent pump. Why waste your time on them when you know they're both marginal?
 
I 2nd ditching them and upgrading. You will not see 12 psi combining them. Fass and AirDog are expensive but they are extrememly reliable with excellent warranties. If you are planning on keeping this truck for awhile you should invest in one... ..... or both :)
 
Thanks Guys, you know there is so much varied opinion on lift pumps for our trucks that i don`t really know what to buy! i not highly modified at all superchip on its lowest setting and 4"exhast ,banks powerelbow and banks intake. and i never drive hard , my trucks runs fine on the carter thats in it but its only a year old and showing less pressure than when it was new. I have heard so much bad news about the DDRP that i cant go there and there doesnt seem to be a lot off talk on the Raptor rp-100 . i just need a pump with a little more than stock that will last . whats your opinion?
 
Someone here on TDR, his handle is TWest, makes a 2 pump oem conversion that he claims is designed be reliable and redundant. It is for the 3rd gens, so I don't know if it will work on your truck, but TWest is a diesel mechanic and knows ALOT of our trucks fuel problems. I think that it wold be worth your while to call or PM him directly.

There is a thread for it here, I'll see if I can find it for you. AHHH here it is... .

https://www.turbodieselregister.com...2003-2007/211979-dual-factory-lift-pumps.html
 
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I'm running two carters in series, one is a pusher pump and the other is the OEM pump. Running the pumps in series combines the pressure, in parallel combines volume. My two pumps put out a combined total of 23 psi, which I think is too high so I installed a pressure regulator and now it runs dead steady at 14 psi.
 
Well now you all have got me thinking (uhoh :-laf) and I have a question to ask that actually IS in line with the OP question--

If someone wanted or needed to run 2 Carter pumps, would there be advantages to running the 2 pumps in parallel instaed of in series??

I am NOT saying that wlowe is doing anything wrong!!!
I am ONLY wondering if it would ALSO work to run the pumps in paralell to get more volume (say for pump lubrication and/or cooling purposes??) as long as fuel pressure stays at about 12 psi??
I mean, particlarly if you have to run a pressure regulator to cut psi by 50%, why not just hook em up in parallel and have more flow through the whole system??

Of course , you would need TWO drawstraws, and likely a couple of backflow preventer valves, so maybe plumbing the whole set-up is harder to do in paralell rather then in series, and probably there is really is NO advantage to running more volume at decent pressure, but now I am just curious and its not REALLY hijacking the thread... So whaddya guys think??
 
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its my experience that the carters don`t break down totally they just get weak so if by combining 2 you could get much more milage from them in total. but i will agree that its a lot off foolin around for pumps that we know are no good, but what is the alternative ?

DDRP seems to be junk too! how many have tried the Raptor rp-100 ?
 
I use airteks and either way works great. However, if you run them parallel you can put ball valves on them and shut one off if you need too, example one goes bad. I was running one airtek in series with the modified in tank pump. The in-tank pump died and the truck stopped running. The airtek was sucking all kinds of air because the second pump was bad and the fuel would not flow smoothly.



So my recommendation from experience two pumps in parallel works the best and will not leave you stranded if one dies
 
Sounds like a lot of trouble to try to do 1/4 the job a FASS pump will do. Just save some $$ for a couple of months, buy the FASS it will protect your expensive truck and SMILE for a while IMHO
 
Hi Gregg; To address your lift pump question , my experience has been that after installing 4 pumps in about 140,000 miles I bought the vulcan relo kit from Genos and installed the regular pump just outside the tank. I have about 60,000 miles on this pump and it shows 15lbs at idle and will not draw down below 10 psi at full pull. It sure is alot cheaper than the Fass and in my experience just getting it off the engine solves a lot of problems. With your steering problem you might try the BD steering stabilizer. I've had great results with my 01. Good luck, Brett
 
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by regular pump do you mean the carter that was bought on your truck?

i have asked several time on this site for some opinion on the Raptor rp-100 pump ,it can`t be very popular cause noone has commented on it. other than the problem plagued fass DDRP the raptor is the next least expensive and i`m surprise noone has tried it.

i put a new carter on my truck about 6 months ago and it only showed 8lbs after the fuel filter ,did you test your before the filter? thanks
 
I have the raptor, after 3 oem lPs and a POS walbro. IT seems to be just fine, idle pressure 15-17 and WOT 11-13. I also have the big line kit from the fuel filter to the VP. I agree with the others buy an after market LP and not worry about it.
 
The AirDog on my '01 has over 400,000 miles on it and the only thing done to it is changing the filters. Well worth the peace of mind about not ruining the VP44. Also, the Fleetguard replacement filters are less expensive than the stock filter or FASS.

Godspeed,
Trent
 
Yes, I do mean the Carter. And yes I do have the sending unit after the fuel filter. I don't have any experience with the Raptor. But I do have a buddy that is now on his 3rd ddrp fass with about 15000 miles on all . Not a great record. Brett
 
Running the intank pump and a carter from Summit. The intank pumps are very reliable, just low pressure. Most autos for years have used the intank styles. The carter brings it up to 15. Going on 50k miles with no issues. Also put a bypass around the carter in case it quits.
 
great, but waht about the wireing side of it can 2 pumps be run from the same wire and fuse? or will i need to run another wire directly from the fuse box?

this should work good with the new OEM pumps from cummins, apparently the new ones have a mechanism designed to let fuel flow through them much easier if they stop working!
 
I installed the Walbro pump on my '01 3 years and 45k miles ago. First pump failed a year later and Richard? from Glacier Diesel overnighted me a new one under warranty when I called him. Great guy to deal with. Newer pump has been trouble free for over 30K. I run 17psi at idle and WOT drops to 15psi. This after replacing 4 oem pumps in less than a year. FWIW almost any aftermarket pump is better than the stock pump IMO.
 
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