What size of fuel pump is needed

[SEmerson]

I was looking at getting a mallery pump for my tired lift pump. What size do I need? I want to add a pe comp, dd3, and maybe a little more. So how many gph will I need to flow?



Also do the ISC's use a lift pump? Is it the same as the ISB?

 

[CumminsAholic]

What a coincidence... I talked to Doug from Advanced Diesel Technology tonite. He told me he just put a new mallory pump on his truck today. You should give him a call, I'm sure he'll set you up. 724-335-6167, www.smokindiesel.com

Corey

 

[Bigsaint]

Mallory 140

That's what most of us running Mallorys are using, some the 140M (Marine version and no, I don't know the difference). Mine is designated the MAL-4150. It has more than enough flo volume to keep up with what I have. You can adjust the psi's via the 'deadhead' , up to 14 psi's max. I have mine set at 13 psi's/idle which equates to an average of 8 psi's at WOT ( post filter numbers). I can drag it down to 5-6 psi's for a very short time at initial full throttle, but it recovers very quickly to about 8-9 psi's under sustained full throttle. I purchased mine through Century Performance and listed below are to links to their site. The second link gives some decent info on fuel system set ups and explains flow V. pressure.



http://www.centuryperformance.com/cbSearch.asp



http://www.centuryperformance.com/fuel.asp



If you click on the first link then go to page two, you will see the MAL-4150, which goes for $186. 00 + change. The pumps are completely rebuidable ( my first one died and it cost $50. 00 for the repair, which was done and returned to me in less than a week through Century).



Hope this helps !!!

edit... the first link didn't go through to the pumps, just do a product search under Mallory Fuel pumps, it will take you there.

Scott W.

 

[TxDieselKid]

what is it about these...

I have a couple questions... .



1) what is it about the 4150 that makes it compatible with diesel? Not all fuel pumps can flow diesel right?



2) was looking at summit catalog and saw a pump from a company called Magnaflow I think. Said it was ok on both gas and alcohal, would it flow diesel then?



3) What are some other pumps being used?



4) would it be possible to get rid of the p7100 on a 12 and get a pump like this. (I know the P pump can flow WAY more then anyone can dream, just curious. )



5) I notice on Pier's Website that he groups the pumps together with the VP, and talks about full race pumps. Can this be done with a VP? I know DD did it for a while, but only got about another 50 horses out of it.



That's all I can think of for now. Please answer if you can, dont feel compailled to answer all.



TIA,

AJB

 

[SEmerson]

TxDieselKid



alcohol is a dry fuel. That is way not all pumps are rated for it. Diesle is very oily so almost any pump will live a long time with it. Gas is in the middle.

 

[SEmerson]

Do I need a reg with the 4150? And also can I wire it right to the old lift pump wires or do I need a relay.

 

[TxDieselKid]

so then 2+2=???

Originally posted by SEmerson

TxDieselKid



alcohol is a dry fuel. That is way not all pumps are rated for it. Diesle is very oily so almost any pump will live a long time with it. Gas is in the middle.

So are you saying that really any pump will work with diesel?



AJB

 

[SEmerson]

I will probly get flamed for this long answer but... ... ... ...

yes ... ... ... ... . as far as gaskets and lubercation are concerned.

I supose gelling and diesel thickness could be a problem with a light duty pump but that should be the only problems.

 

[John]

Mallory 4140M (marine)

I just added a Mallory 4140M (marine) electric fuel pump and System 1 prefilter (30 micron stainless steel, pleated screen capable of very high flow). I can't report on how well it works yet (just finished the project and didn't have time to to start it up... repriming the system etc. )





..... knock on wood... I hope I didn't overlook anything!

 

[Steve St.Laurent]

Txdieselkid - The pump they are talking about here is a replacement for the low pressure lift pump, not the high pressure injection pump. There would be absolutely no reason to replace the P7100 (except with a better P7100) on a 12v. Many of us 24v owners WISH we had the P7100. The reason he's changing out the lift pump is because the stock pump has been horribly unreliable. Do a search on lift pump and you'll see what I mean.



SEmerson - the ISC uses a totally different lift pump than the ISB. It has two inlets and two outlets. I had looked into it in my search for a better lift pump - couldn't see anyway of making it work (well at least not any easy one).

 

[WAYNE]

I think the mallory 4150 is a great setup , so far all is good with mine, just mount a filter before the pump for extra protection, you dont need a regulator with this pump.

I was told by a tech at mallory that the only difference between the 4150 and the marine version was that the marine pump was coast guard approved because the main body was anodized to protect against corrosion, also its more money.

 

[Archive]

I was running the Summit pump @ the fuel tank and it went out on me. Since I am my own warranty station, I disassembled it only to find that the pump cavity itself still looked brand new. The actual problem was that the pump motor is not a sealed unit and was full of dirt. I cleaned it out, bench tested it and it's pumping as good as new again. There is a lot of water, grit and garbage the pump is exposed to when it's riding down on the frame rail. I would recommend that only pumps with a sealed motor be used there. I'm currently contemplating building a sheet metal cover to protect my Summit pump from the elements and reinstalling it in the same location.



BTW, I think the use of a 30 micron pre-filter is a terrific idea.

 

[Mopar-muscle]

i may get flamed for this ... ...



i'm running the carter HP pump , in the stock location , factory juice direct . its been in since march , no problems . i'm not saying its the right thing to do but it seems to be feeding my 410 RWHP monster very nicely ... i am going to move it rearward and build a cover to protect it from the road grime of new england winter .



the stock factory fuel filter flows something between 45-60 gph , even the carter is over kill at 110 since it being chocked by the fuel filter . still looking for something better with a heater and WIF sensor that will fit under the hood .

 

[SEmerson]

Can I tap into the stock electrical wires? Or do I need to put a relay in to handle the amps?

 

[Bigsaint]

While you can get away without a relay ( I did for about 5 months with the first pump), a relay is cheap insurance and should be included in the install, along with a good pre-filter, IMHO. If you go the relay route, just use your original pump hot wire as the trigger for the relay, works great.



Scott W.

 

[Bob Cochran]

Will a second pump located at the fuel tank pump through the OEM if it goes bad if plumbed in series? I think if it will that would make me want to add one. If not, I am not sure I want to replace OEM because of warrantly concerns.



Sorry just read my orginal and it made no sense!!! So I fixed it.

 

[John]

I'll second Bigsaint's strategy.



BTW, the Mallory Marine electric fuel pumps are Coast Guard approved for longevity (among other things)... the others are not.



Bigsaint, what was the procedure for increasing the Mallory fuel pump pressure? By that I mean, how many turns (or fraction of a turn) equals 1 psi increase? Would I be safe in assuming that backing out the adjustment Allen head setscrew would increase pressure? Also, is it safe to make a pressure adjustment while the pump is running or should this adjustment be made with the pump off?



... just wondering... I didn't want to wait until Tuesday to talk to a Mallory tech. about this.



Thanks

 

[tgbol]

The marine pump also sealed against spark so that it won't blow up a boat that has a build up of fumes in the hull.

 

[Bigsaint]

John, I learned the hard way on the pump adjustment, here's the right way. With the truck running and warm ( I see higher psi's when it's warmed up compared to a cold start) loosen the nut on the allen set screw and then turn the allen set screw clockwise ( righty tighty) just a small amount, maybe a 1/4 turn at most. Then wait a minute, watching your FP. If not enough, just tighten a bit more untill you get the desired psi's. Whatever you do, do not perform this task with the truck/pump off. I did with my first and it was not nearly as precise as doing so when they are running.



Scott W.

 

[LFarrar]

fuel pump

I have installed Holley blue pump 110 gph added pre filter and as close to tank as possible. stock pump I removed and inserted alum. block tapped om both ends for banjos and drilled a port for my liquid filled gauge,this is pre stock filter 13 psi at idle,wired off of stock,but I do think the relay would be nice addition!!