Duramax lift pumps? GPM use and PSI limits?

[WarWagon]

What can the CP3 use on my LLY? What is a slightly sane pressure to hit the system with for a lift pump? How many GPM can it use with ~100 HP over stock?

I just completely plugged a filter and have to clean out the fuel system. However, the filter plugging up is a cause of some light throttle surge I have been getting.

The junk AC Delco units are out of the question that some Duramax trucks have.

So 7 PSI, 14 PSI?
50 GPH, 100 GPH, or 140 GPH?

 

[THEFERMANATOR]

For mild DURAMAX applications I like the KENNEDY single pump that I have on mine. They don't need much pressure, but need volume. Also be CERTAIN it is a flow on fail design as the CP3 will not suction fuel that well under vacuum. And much more than 8 PSI requires tuning to the rail valve current to make it idle properly.

 

[Pepperidge]

I'm running twin Laing D5 Strong 710B same pump as a kennedy but without the high price...

 

[WarWagon]

I am not seeing that pump cheaper than KD.

Good info. I need Methanol compatible pump for biodiesel use. Flow on fail may have to be a check valve...

 

[Pepperidge]

Kennedys pump is $195 a relabled D5 strong with his spec'd head...

TTS (Steve Cole) has it in the Brass top configuration but still too expensive (complete kit only) $360 Single Dual $485




If you know where to look you can get the laing for around $140 shipped...

I purchased just a replacement laing D5 strong pump for $89 shipped from a computer cooling company(koolLance)... the only thing was, it had the noryl(sp?) head so I just re-used my brass pump top... same D5 strong motor and impeller assembly...just screwed right onto the pump head...

they buy so much volume from Laing for their computer cooling sales, I'm betting I could get them to order the D5 strong 710B for under $100 for me...I just needed the replacement motor/impeller assembly and figured I didn't want to wait for a special order from them so I didn't bother trying...

Here is the laing 710B

and the pump from KoolLance

I peeled the KoolLance lable off and the Laing D5 Strong label was still there...LOL



ON EDIT: Noryl is NOT Chemical resistant and can't be used with diesel...


the Laing pumps are Flow on fail...

 

[Pepperidge]

Noryl is not Diesel Compatible...you have to use the brass head...but the pump motor and impeller assembly is interchangeable for replacement purposes...

 

[WarWagon]

For the KD cost why not simply go Airdog? Of course his full kits improve the fuel pickup assembly. The airdog would have filters...

Brass turns green with Biodiesel use. It is known to be incompatible with Biodiesel and I should be using steel or aluminum fittings. The brass fittings I use on lift pumps and filters do turn green. However it might last the life of the pump - about a year for me.

Brass, bronze, copper, lead, tin, and zinc may accelerate the oxidation of diesel and biodiesel fuels and potentially create fuel insolubles (sediments) or gels and salts when reacted with some fuel components. Lead solders and zinc linings should be avoided, as should copper pipes, brass regulators, and copper fittings. The fuel or the fittings will tend to change color and insolubles may plug fuel filters. Affected equipment should be replaced with stainless steel, carbon steel, or aluminum.

So I see where KD has done his homework in specifying the materials.

 

[BudTX]

I am running a FASS 150 with a shimmed rail.

A 95 should be plenty for 100 hp over stock.

 

[Mad Maxx]

I got the TTS Dual's and have no Complaints.

 

[Pepperidge]

For the KD cost why not simply go Airdog? Of course his full kits improve the fuel pickup assembly. The airdog would have filters...

Brass turns green with Biodiesel use. It is known to be incompatible with Biodiesel and I should be using steel or aluminum fittings. The brass fittings I use on lift pumps and filters do turn green. However it might last the life of the pump - about a year for me.

Brass, bronze, copper, lead, tin, and zinc may accelerate the oxidation of diesel and biodiesel fuels and potentially create fuel insolubles (sediments) or gels and salts when reacted with some fuel components. Lead solders and zinc linings should be avoided, as should copper pipes, brass regulators, and copper fittings. The fuel or the fittings will tend to change color and insolubles may plug fuel filters. Affected equipment should be replaced with stainless steel, carbon steel, or aluminum.

So I see where KD has done his homework in specifying the materials.

my mistake...but The 710 is actually Bronze... I didn't see any change of color or any oxidation on the inside of the head when I changed the pump motor/impeller assembly...I had run B50 from a friends private stock through it once...but I'm guessing that short term use would not cause the issues you mention...

I doubt you could get an airdog for $140(the cost to run a single Laing pump...a single will allow you up to 375 RWHP a double up to 600 I've run mine for $100k miles and the only reason I had failure was my mistake and let the pump run dry...that is a BIG nono with these pumps...even then it still worked...just got loud/with a vibration, so I replaced it...

I was planning on going AirDog but the stock filtration is lacking...although there are some options out there to change to better filters....my point being why wouldn't they just change the nipple to accommodate better filters?

I'm actually still thinking airdog but the unit I need is like $700(AirdogII 200) for the power levels I run and on top of that I need to immediately buy better filters... another $75

check out this site for Chemical compatibility with bronze and Brass
they are both rated A excellent for both Methanol and Diesel Fuel

http://www.coleparmer.com/Chemical-Resistance

they are really quite simple and reliable

 

[WarWagon]

Good to know about these pumps. I have some issues to address with fuel suppliers as well. But so far I am coming away with more options than I thought.

How are you controlling the pumps? Oil pressure and relays?

 

[Pepperidge]

Good to know about these pumps. I have some issues to address with fuel suppliers as well. But so far I am coming away with more options than I thought.

How are you controlling the pumps? Oil pressure and relays?

key on/pump on relay ...I'm using the painless wiring kit for electric fuel pumps bought from summit racing...

 

[Pepperidge]

all this talk about pumps reminded me that I removed my OEM on engine fuel water separator/filter...

I can't only have one filter and so I just ordered an AD165 kit and will change the filters to better ones when it's time to change them...

I hope I like it...the Laings are super quiet...you can't really hear them run...I heard the Airdog is definitely audible...I really didn't want that, so thats why I went with the laing pumps...the new airdog will be good up to 800 rwhp plus removes the entrained air...

I may have a twin laing setup for sale soon...

 

[THEFERMANATOR]

I use the stock 6.5 OPS to control mine wired in to turn on teh fuel pump relay. The 01-02 DURAMAX uses teh same OPS as the 6.5's, so it just made sense to. Most just wire it in to come on with the key though.

 

[kidturbo]

Little late to the topic, but here is another good choice for ya.

Edelbrock 1792 - OEM is SX Performance. $220 at Summit

Pump is alcohol compatible, so it's good with biodiesel. I've ran this pump for 3 years now pushing B50/B100 to a built Dmax with single CP3. Offers adjustable fuel pressure up to 12PSI and 160GPH flow rate, there is also a #1791 version that's a bit cheaper and does 6.5PSI, good enough for most stock diesel applications. I've read mixed reviews on this pump over the years, but when mine messed up this spring, I just tore it apart and cleaned all the oxidized biodiesel from inside, lubed it up, and now doing fine again.

Used the easy wiring kit listed above, key on pump on.

-K

 

[THEFERMANATOR]

Little late to the topic, but here is another good choice for ya.

Edelbrock 1792 - OEM is SX Performance. $220 at Summit

Pump is alcohol compatible, so it's good with biodiesel. I've ran this pump for 3 years now pushing B50/B100 to a built Dmax with single CP3. Offers adjustable fuel pressure up to 12PSI and 160GPH flow rate, there is also a #1791 version that's a bit cheaper and does 6.5PSI, good enough for most stock diesel applications. I've read mixed reviews on this pump over the years, but when mine messed up this spring, I just tore it apart and cleaned all the oxidized biodiesel from inside, lubed it up, and now doing fine again.

Used the easy wiring kit listed above, key on pump on.

-K

Keep in mind that this pump is NOT a flow on fail design. So if it quits, your stuck on the side of the road.

 

[kidturbo]

Keep in mind that this pump is NOT a flow on fail design. So if it quits, your stuck on the side of the road.

Good point. I've tested mine "powered off" and it passes enough fuel to allow the engine to run, could still limp mode under power. It's a vane type pump with a simple built in spring loaded bypass regulator valve.

Where I had issues was the screen inside is a very fine mesh and easy to clog. When it's working correctly, solved my low fuel pressure issues under WOT on B100. Data logging also supports less drop between desired and actual fuel pressure with oversized injectors, no matter what fuel blend is in the tank.

-K

 

[RI Chevy Silveradoman]

I am running the KD dual lift pump setup. I really like it. It was very easy to install, and in my opinion very professionally put together. I was also trying to buy the same pumps as Paul, but called about 10 places that were listed as dealers on the Laing website, and nobody carried them, or even knew what I was talking about. :???: By the time you put all of the necessary components together to install, your probably better off just buying the kit. One stop shop. I also did the billet fuel pickup install at the same time. The fuel pumps are very quiet, and it is a snap to change fuel filters, as it has a prime bypass button. I am very satisfied with mine.