Boost Pump Questions

litton · **Posted:** Thu Nov 08, 2007 12:03 pm

I am seriously considering adding the lift pump but have a couple of questions for those that have done this.

Is there any significant differance between the two pumps I've seen discussed on the forum?
I have no intention replacing or modifing the fuel filter assy at this time if it can be avaoided.
I also don't want to install an in-line cooler for the fuel.

I have read posts that the lift pump will reduce engine noise, increase fuel mileage, reduce turbo lag, increase power, and etc, The only thing missing is curing a cold.......why would a 4 psi lift pump achieve all these remarkable benifits?

Will either (or both) of the lift pumps function properly without doing the above mods?

Thanks for any input.

Cowcatcher · **Posted:** Thu Nov 08, 2007 12:42 pm

I am not experienced here but I will probably do it in the spring and I have purchased my pump, a Facet 40109. The two pumps most discussed here is this pump and the Kennedy. The Kennedy is probably better and quieter but it is 5 times the price. If money were not an object I might consider it but I am cheap and I am not convinced that the added cost of the Kennedy equates to added value for our application. If someone can convince me otherwise I have a Facet 40109 for sale. :wink:

Sir Sam · **Posted:** Thu Nov 08, 2007 2:40 pm

Wow, boost pump just sounds so cool.

I wanna invent one and put it on my car!

gmctd · **Posted:** Thu Nov 08, 2007 6:48 pm

already got one - over on the exhaust manifold....................

Hold off a bit on your decision, litton - I'm looking into something a little more plug'n'play - should know something more by late Saturday - may have to pull the distributor rotor on #2son's CRD to keep it in the yard long enuff to do the R&D

onthehunt · **Posted:** Thu Nov 08, 2007 8:38 pm

Quote:

I have read posts that the lift pump will reduce engine noise, increase fuel mileage, reduce turbo lag, increase power, and etc, The only thing missing is curing a cold.......why would a 4 psi lift pump achieve all these remarkable benifits?

If it sounds too good to be true......

litton · **Posted:** Thu Nov 08, 2007 9:46 pm

onthehunt wrote:

Quote:

I have read posts that the lift pump will reduce engine noise, increase fuel mileage, reduce turbo lag, increase power, and etc, The only thing missing is curing a cold.......why would a 4 psi lift pump achieve all these remarkable benifits?

If it sounds too good to be true......

Perhaps, but if you read back to the posts on this subject they all seem to be mentioned. Granted there is always the wishfull thinking and the rationalizing a purchase but too many have posted positive results to discount. Personally, I have never experienced the reported problems with the stock system but by the same token I am not a great fan of vaccum feed fuel supply. After all....vaccuum sucks.

Serendipity · **Joined:** Mon Nov 20, 2006 10:51 pm **Posts:** 45

All I remember claiming was that it fixed my air problem. There may be a little more low end grunt, but it could be wishful thinking. I guess if you were having a bad enough air problem, the benefits might be more pronounced.

CATCRD · **Posted:** Thu Nov 08, 2007 10:42 pm

litton wrote:

I have read posts that the lift pump will reduce engine noise, increase fuel mileage, reduce turbo lag, increase power, and etc, The only thing missing is curing a cold.......why would a 4 psi lift pump achieve all these remarkable benifits?

It won't do any of those things for a jeep that's acting normally. To the extent that it gets rid of air in the lines it works. I have the 40109, I think the jeep is louder now, no more powerful or responsive.

Stan Wright · **Posted:** Thu Nov 08, 2007 10:45 pm

My lift pump made the motor quieter and made the base motor more powerful to the point of not noticing the turbo lag anymore. I can't claim better mileage.

litton · **Posted:** Fri Nov 09, 2007 12:34 pm

Interesting but back to the basic questions.

Are there any significant differances between the available lift pumps and can they be installed without changing/modifing the fuel filter, lines, and etc.?

Threeweight · **Joined:** Mon May 14, 2007 5:57 pm **Posts:** 679

If you have the air in fuel problem causing your Jeep to shudder/run rough/not start, it seems a lift pump would help. Of course, so would fixing the problem of air entering your fuel system (with a better filter head, etc...)

I am dubious of any claims of pumps doing anything beyond that.

gmctd · **Posted:** Fri Nov 09, 2007 1:46 pm

All things being equal, the stock oem system is probably suitable for most operation - all things being unequal is where the problems begin - air leaks, maintenance routines, geographical location, vehicle useage........people.
Towing will usually reveal system shortcomings, where normal everyday 1-2 passenger jaunts are unremarkable events - only the Cherokee and Wagoneer were spec'ed to tow a tandem-axle recreational trailer, but with-in limits, at that.

There is no plug'n'play option - installing a remote fuel transfer pump - lift pump - requires opening the fuel supply pipe to facilitate inserting the electric pump in series, therein - low pressure low volume is the key, not requiring a bypass line be installed - the wiring and ECM control has been fortuitously provided by DCX.

If you tow much, I would recommend a fuel-return line cooler, as the KJ wheelbase is too short to allow sufficient HD useage cooling - Jeep CP3 EFI system manages in-tank fuel temperature by reading inlet fuel temperature, then restricting input fuel to reduce hot rail-bypass fuel-return back to the tank - can this cause some of the surging, shudder, hesitation, 'leaning-out' under a load?

Dunno, but GM agreed with Bosch recommendations, and installed a rtl cooler in the DMax CP3 CRD system - DCX doesn't monitor inlet fuel temps for the Cummins CRD, and they have had some system problems with the CP3 internal seals

It's all about driveability - if (collectively) your Jeep experience is satisfactory, no need for a fix at this time - but the fix has solved some problems for some Jeeps, so it's here in various and sundry detail if you need it.

brew1 · **Posted:** Sat Nov 10, 2007 2:47 pm

I'm considering installing a Facet 480532E pump to keep up with the increased fuel demand due to a recently modified ECU program to RC1, as well as be prepared for future modifications of the ECU program to RC2. I can tell when accelerating at higher speeds it seems to be starving for more fuel.

I would imagine the fuel pump and time to install it would be less expensive and less time consuming than having to replace 4 fuel injectors. I haven't replaced injectors on a Liberty CRD yet but based on my experience with replacing them on my TDI this would be my HO.

gmctd · **Posted:** Sun Nov 11, 2007 4:18 am

Check out ???????

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