Pusher Pumps vs. Hi Perf. Pump

[Bigsaint]

Thanks John, good info for sure !!! Yes, I will join you in a toast to the Mallory, long may she live .



hammersley, you can buy a Mallory 4150 from Century for $186. 00. Do a product search on the site for Mallory fuel pumps then look for the gas model priced at those $$$$. The folks at Century are good people to do business with, when my first one died I called them and had it shipped back to Century. They are apparently close to the Mallory center and the cost for a rebuild was $50. 00. The pump comes with a decent diagram and detailed instructions for a tear down. I had mine apart after it's failure and found a decent amount of sediment in the bowl of the gerator. The brushes are also replaceable, though I haven't tried this I know that Nowel (HVAC) replaced his after about a year of service.



As for wiring, I went with a relay the second time around, using the existing wire from the ECM that powered the Carter pump as the trigger wire for the relay. When you key on, the trigger wire closes the relay and allows the source power (from a fused line coming from the battery) to power the fuel pump.



http://www.centuryperformance.com/index.htm



Scott W.

 

[Diesel Freak]

I received my Summit order today. I installed the post filter section of my fuel system so I could get an idea how my lift pump is doing.



Cold Idle: 12. 5psi

Warm Idle: 11. 5psi

Cruising @60mph in 6th: 9. 5psi

WOT in 5th at 2900 RPM: 3psi



pressures should go up once I replace the rest of the banjos and move the pump back by the tank.



My pressures might be lower than actual because I lost a little of the EG that was in the Gauge Isolator.

 

[TxDieselKid]

Re: Re: Blows my mind...

Originally posted by Diesel Freak









BINGO!!!!!!!!!!!!!!!!!!!!!!! Two Carter HP4601's in Parallel... why didn't I think of it sooner.



cditrani, You da Man!!!!!!!!!!!!!!!!!!!!!!!!!!!

You mean something like this, only with Carters... ?

#ad




Andrew

 

[DiTrani]

Something like this

Yes, exactly like that. Not only would it, in theory, allow a fail-over mode, but it would reduce the work on both pumps and might make 'em last longer. Someone must've tried this, or maybe someone smarter than me knows why it wont work.

 

[Mopar-muscle]

well almost like that , only one regulator required in this case possibly before the fuel filter . the stock filter is still a GPH restriction , then you need to have check valves so if one pump dies the other doesn't pump back thru it as the carter has an internal bypass . , fuel will go the path of least restriction .



my final system will have 2 pumps , one on the engine as a backup and one back at the tank , 2 electric fuel solenoids like that used in older fords and chevies with dual fuel tanks , if the rear pump dies , hit a switch and the backup is put in play .

 

[Diesel Freak]

Since most of us do not go wide open for more than a few secconds at a time what do you think of just adding an accumulator to the fuel system? I think one with a three gallon capacity would work. Any other ideas?

 

[John]

Actually, Piers told me of his idea of having two fuel pumps in parallel with a one way check valve between the two pumps..... some time last August. In fact, he also talked about wiring the second fuel pump up to kick in as WOT was approached. Actually this is possible if you have an SPA Fuel Pressure gauge (which I do). As trick as that all sounded, I elected to keep my fuel system enhancement relatively simple.

 

[HVAC]

Parrallel Pumps

There is a truck out there that has been running a parrallel system for just shy of a year now. Works fine.

 

[Diesel Freak]

Originally posted by John

Actually this is possible if you have an SPA Fuel Pressure gauge (which I do). As trick as that all sounded, I elected to keep my fuel system enhancement relatively simple.

shoot it is easier than that... . just need a normally closed presure switch set to open at 5 psi

 

[FL70CAT]

tgreco,



My 3126b Cat has no lift pump, there is a pump on the motor that draws fuel from the tanks and pressurizes the rail to 100psi.

I have been interested in the lift pump discussions and am considering putting one on my truck with the hope that it will feed the factory 100psi pump and be able to maintain closer to 100psi under load. Currently it drops to around 60-70psi under WOT pulls.

 

[redneckdr]

motorhomes

fl70cat, you and i have somewaht similar motorhomes. my "rollin' redneck residence" was custom made on a fl70 chassis. i have a cummins C8. 3 hooked up to an allison md3060. i love mine. what do you "tote" with yours?

 

[Diesel Freak]

It's Finished!

Got my fuel system done. I relocated the OEM lift pump to just above the rear crossmember that supports the xfercase. my idle pressures are still at 12psi, but after moving the pump, my WOT pressure went up from 3 to 7. 5psi. I am now a very happy camper.

 

[MikeR]

Re: Blows my mind...

Originally posted by cditrani

... that this problem can't be fixed simply. I would've thought that with all the marine/construction/industrial engines out there, there'd have to be a fuel pump that would last past 100K without even thinking about it, regardless of where it was mounted.

It is easier said than done. See the problem is, marine/industrial/construction equipment don't run the high rpm's that we do where we can easily suck down the available pressure while demanding full power at high rpm's. Marine/industrial engines are governed very low revvers, and sufficient fuel pressure and flow can keep up with the slow rpm's.



A while back, I had gone to a few diesel marine shops in our area and they had all told me the same thing... all the pumps they sell are low pressure pumps for low revving diesels.

However, they all looked at my stock pump location and all had the same conclusion... they said the problem is the lift pump should be next to the tank, and there should be a filter between the tank and the lift pump.



Bigsaint,

I remember you posting about Century carrying Mallory pumps, and I recently checked their site but they raised their prices to the same as Jeg's and Summit.



-Mike

 

[Ram4Sam]

pump wire

Diesel Freak, how did you power the pump? Can you just lengthen the factory power supply to run the relocated pump?



Sam

 

[Bigsaint]

MikeR, I just checked the Century site, still $186. 99. I'm guessing that you called them and was quoted a price ?? I was speaking of the 4150, not the 4140m, maybe that was the confusion. Your paying more for the 4140m as it comes with a regulator, that you don't need. I understand that the Marine version has a different coating, which sure can't hurt to have but I'm just using the 4150, listed on page 2 of the Mallory pumps on the Century site.



Scott W.