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lift pump question - yes, again!

VW_Lupo_TD

VW_Lupo_TD

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Lift Pump 98 K1500 OEM - 25117340
Lift Pump 97 K2500 OEM - 15754298
Lift Pump (Higher PSI) OEM - 25115224

ok guys quick question, this morning i changed fuel filter and of course noticed no fuel coming out of filter manager drain hose when I tried to drain the manager. Exactly the same as the day before I left Detroit, so I knew the deal.

But I am getting tired of the lift pump issue.

Questions:
1. If i get an OE pump - which one (see part numbers above)?
2. Is there an alternative to using this type of lift pump ?
Something more reliable ? (kennedy?) that is a direct plug & play ?

kennedy1.jpg


3. If it cannot be plug and play - go ahead give me the hardcore solution that will last forever. (kennedy ? Walbro ? etc.?)
Hell - i do not even care if it runs with the OPS, relay and all that crap. I need a pump that will suck a golf ball through a garden hose and a flip switch ;-)

Twin_pumps%20_overhead_bracket.jpg

liftpumpswitch.gif


Someone needs to do a write up for this and give every one the opportunity to get rid of that design once and for all.....

(Yes, yes - I will do a write up if i find something that works)

rgds
 
Hmm, another failed LP, thats odd. The fuse is OK? Did you try powering it on both sides of the fuse? And had you checked for a clogged sock in the tank before?

I would not get another OE, unless you just need to be on the road long distance right away. If so grab one for a 1993 truck.

Ultimately I would get an airdog or Walbro. I have a Walbro, works really well, and the company has good customer service. Airdog has built in filter/water separator which is nice. I would cut the factory lines to the LP and flare the ends (not required though). You can just cut and smooth the ends and slide 3/8" hose over it and use a couple hoseclamps (mine has been that way for 10+ years). Then just route hose to the aftermarket LP where you can get it mounted. I installed mine on the tranny crossmember. AS SEEN IN THIS THREAD Or these pics
FTB FRB5 LP-small.jpg FTB PreFilter Mount-small.jpg
You can just custom rig anything really, as you can see here. I just drilled some holes in the frame, and a couple on the xmember and that was the hardest part. Pre-filter not required, but a good idea, and get rid of that sock in the fuel tank.
 
If your blowing through factory lp's then it is 1 of 2 things. Either a lot of lp's that were made w/ yours are bad as well or your fuel system has a clog in it somewhere. I just delt w/ the later a couple of months ago. I pick up some dirty fuel somewhere and it clogged my sock. I would check there.
 
Are you sure it is not the OPS that fails? The OPS is weaker than the LP.

The KD harness is a good mod, that is similar to the Relay mod here.
It minimized the problem of the OPS to almost none.
 
Burning oil has a line kit that makes the Walbro or Airdog plug and play with the factory fuel lines. For some reason I thought he also sold the Walbro pumps but don't see them on his web site.
 
Grab a 1993 HO LP, Lift Pump (Higher PSI) OEM - 25115224.
I have one which is able to sustain 2 PSI at WOT.
Plug and play

I believe that as long you get pressure at WOT, that means it's enough.
It shows about 10~12 PSI during wait to start cycle, and about 7~5 PSI while cruising.

My 2nd choice will be Walbro FRB-5. I mean 2nd because of few plumbing to do, not plug and play.
So, if I had time to fab brackets and all, it would be 1st.
Veg out sells a connectors kit for these.
According to Matt, there's a new designed one coming soon, the FRB-28
 
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Its not the OPS, he cant even get it powered by putting power directly to the line going to the LP. Like the test port in 96+ on the fuse/relay center. In 94 we just push the fuse against a battey junction post.

Although if you have not done the relay mod for the OPS its a must do.
 
I kinda keep quiet about this now cause of all controversy I stirred last time around but since you asked what the BEST availible is I'll post.
The Airdog or it's non filtered Cousin the Raptor is probably the best availible if you want to spend the bux. It also solves the OPS problem by incorporating a separate realy to send Batt power directly to the LP (sort of like Kennedys harness) and takes the strain off the OPS. The Raptor/Airdog is lifetime warrantied and I can speak from personal experience of thier excellent customer service. A few vendors here sell them. I believe Rich from Dog House can get them as well as Upstate Diesel.
FWIW I have a RAptor on my Dodge. The PSI is fully user adjustable to whatever your needs are and believe me nothing out there has the flow like these do. I ended up with an extra one thanks to scumbag Lee's Auto Ranch in Ellington CT so I plan on using it for my CUCV when I toss the Mech junk one. It's way overkill but I have it so why not use it.
They make a kit specifcally for the 6.5 with all wiring etc included.
Also they are flow on fail and lifetime warrantied(as long as you fill out the card, don't forget)
Some will say 400$ is too much for a LP but when you figure in the relay harness is included and Kennedy get 150$ + shipping for that IIRC plus another 100$+ shipping for a standard LP your already up to 250$ and you've bought how many already ?
It's kinda Like Heaths PMD setup. You could get one 200$ cheaper but when it burns up, no warranty...
 
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Have a look at the gnd, if it's crappy and OPS is good, maybe high current from crappy gnd is killing the motor or IC chips in the control of the pump, unless he changed the design the Kennedy pump was not self priming when 1st introduced, which would worsen reliability IMO, As much as some like to comment on price of things IMO the Kennedy relay is very pricey for a simple relay & prime setup you can do yourself.

I didn't add relays to either of mine as on 96+ it isn't necessary 2 tron paths for the pump PCM & OPS, OBD-I trucks are OPS only supplied, that said IMO OPS change is a periodic maint item, as the mylar diaphragm that makes the pressure reading is a wear & tear item over time, and the plastic body also gets brittle over time so as preventative measure say 50K miles I'd change it, they aren't that expensive.

On my truck I opted to plumb in both the Heath h/o and my Walbro in parallel path with selectable switches and relay controlled by the normal feed for a OEM pump PCM/OPS input to control coil of the relay to where I can run 1 or other pump if one fails, mostly I run the Walbro
 
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you can also get the same pump as a kennedy...a laing D5 strong(with a slightly different head) from TTS one of our vendors...
 
packratt said:
Burning oil has a line kit that makes the Walbro or Airdog plug and play with the factory fuel lines. For some reason I thought he also sold the Walbro pumps but don't see them on his web site.
Click to expand...

It's not nessicary with the airdog. They make a complete kit for the 6.5 including the harness.
 
TD is right, that is what was wrong with my Dodge. Poor connections caused resistance which intern was giving the LP about 4v. Bad install in my case by Lee's Auto ranch.
 
It may be worth putting a volt meter at the LP while it's runnig UNDER LOAD and see what's going on. That was how I finally figured out what was wrong with the Lemon.
 
Pepperidge said:
you can also get the same pump as a kennedy...a laing D5 strong(with a slightly different head) from TTS one of our vendors...
Click to expand...

That pump isn't flow on fail IIRC, meaning if you lose power, or pump fails. you get towed.

With the DB pumps not being all too picky about occasional zero fuel pressure issues, no reason not to get a flow on fail pump IMO.
 
Matt Bachand said:
That pump isn't flow on fail IIRC, meaning if you lose power, or pump fails. you get towed.

With the DB pumps not being all too picky about occasional zero fuel pressure issues, no reason not to get a flow on fail pump IMO.
Click to expand...


It is flow through though...don't know if that's what you mean...
 
If the pump stops Paul, will the fuel stop, walbro & OEM pump will allow the 6.5 IP to pull it's own fuel if the lift pump quits so we call that a "flow on fail" pump, many a Cummins IP has died because it's lift is not flow on fail, gear elements in it block flow and truck stops, & IP dies,
 
Yes...I can unplug the pump and the CP3/IP will pull fuel through...

it's a centrifugal pump there is virtually no restriction...

IIRC TJ had a one fail or a fuse go bad and thinks it was like that for a long time before he found out...

here is the PDF of the laing pumps...the D5 strong is what you will need to look at...

http://www.lainginc.com/pdf/LTI%20D5_091007.pdf


it is shaft-less
 
What is the PSI of this pump? PDF says 150 or 50?? Is there a regulator on it? Our IP's can only handle 14psi max according to some knowledgebale rebuilders around here.
 
Matt Bachand said:
What is the PSI of this pump? PDF says 150 or 50?? Is there a regulator on it? Our IP's can only handle 14psi max according to some knowledgebale rebuilders around here.
Click to expand...


I'm not quite sure...I know it is great for a modded DMAX...

I only brought this up because VWLupo was considering the kennedy pump in his post... which I assumed he researched and was safe and was sold for the 6.5's that he was considering it...

I wouldn't think they were that high of pressure though, as a lot of computer guys use these for water cooling their Personal/Gaming computers...
 
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