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#1
10-15-2017, 11:01 AM
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Deadheaded lift pump
I was talking to someone recently about my MITUSA lift pump, and realized that the blow off from the 12psi regulator actually goes back to the input of the pump instead of running a line back to the tank; this is how Opie set it up, I didn't come up with the design. My pump lasted about 8 years, so obviously it wasn't a huge problem, but I'm wondering what the collective opinion on this might be? I could either leave it alone, or plumb it back to the tank. New pump is arriving tomorrow, so I'll be dicking with it anyway soon
 Am I overthinking this making for a lot of hot diesel and pump wear, or is it no biggie?
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08 LMM Crew 4x4 Dipper Trans/Mark's 68mmStg2R/40 over LBZ tips Exergy 12mm 
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#2
10-15-2017, 12:21 PM
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Going back to the tank might help keep the fuel temp a little lower rather then recirculating fuel over and over and over but I may be wrong
2006 CCLB DRW 6"fabtech 35"s 4.11 w/arb sdp 475 over stock 30% ii nozzles fass150 built trans
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#3
10-15-2017, 01:10 PM
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Turn the pressure down some or make a return line.
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Reger 05' Black Chevy CC/SB LT- Blackout Performance built motor/trans/tuning- Gone The Blessed Hellride- 08' White GMC Sierra SLT CC/SB, 100k miles. Piston eater. Wife's ride- 2016 Pearl white Legacy limited 3.6R Rig ride/new DD-02' Black Eddie Bauer explorer 4.6, -180k, still sporting original trans, outlasted two Duramaxs.
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#5
10-15-2017, 03:44 PM
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Just curious , did the 12psi kill your first pump or has the 12mm been on for a while ?
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05 CC/LB DRW LLY Allison AFE Blade Runner,AFE Momentum CAI,DHD Big Air intake Y pipe, DHD fuel block,DHD pcv reroute,MBRP 4 inch exhaust,DHD 3 inch downpipe,BD driver's side manifold,DHD pass side up pipe,DHD 3 inch intercooler hot&cold pipes, ATI damper,Empire pin kit by Big Foot on & off road shop, FASS fuel system,5/8 inch pickup, FASS fuel filter delete, EFI live,V2 & lap top , 5 position switch 250 hp big tune, shimmed fprv by Crank it up , built SunCoast Allison 1078 converter aftermarket trany mount by Limitless Diesel,ARP head studs,grade C gaskets,tig-welded water pump,T stats by Blackout performance,MA t case brace , Kriptonite motor mounts,MA pump rub kit,HD drive shaft 1480joints by Greensburg machine,BDS Recoil traction bars, PPE finned deep pan , Mike L trany cooler, PSC pump, 5100s, Sulastic Shackles, Curt com 2.5 hitch
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#6
10-15-2017, 03:55 PM
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I installed the pump in 2009 or 2010 and it's always used the same 12psi regulator. Lately I've noticed lower pressure at idle than usual. I swapped to the 12mm and it's actually showing vacuum at idle, though by 1100 rpm I'm back up and holds fine even at WFO. I called up Glacier Diesel, since Rich makes a similar kit for the Cummins, and he said that the pump is shot; housing gets eaten by the shaft. He sold me one of his pumps to swap into my setup, but opined that maybe I'd want to reroute the setup to include a tank return.
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08 LMM Crew 4x4 Dipper Trans/Mark's 68mmStg2R/40 over LBZ tips Exergy 12mm
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#7
10-15-2017, 04:05 PM
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He is the expert on his pump kits , Id go with what he and others have said . Good luck !
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05 CC/LB DRW LLY Allison AFE Blade Runner,AFE Momentum CAI,DHD Big Air intake Y pipe, DHD fuel block,DHD pcv reroute,MBRP 4 inch exhaust,DHD 3 inch downpipe,BD driver's side manifold,DHD pass side up pipe,DHD 3 inch intercooler hot&cold pipes, ATI damper,Empire pin kit by Big Foot on & off road shop, FASS fuel system,5/8 inch pickup, FASS fuel filter delete, EFI live,V2 & lap top , 5 position switch 250 hp big tune, shimmed fprv by Crank it up , built SunCoast Allison 1078 converter aftermarket trany mount by Limitless Diesel,ARP head studs,grade C gaskets,tig-welded water pump,T stats by Blackout performance,MA t case brace , Kriptonite motor mounts,MA pump rub kit,HD drive shaft 1480joints by Greensburg machine,BDS Recoil traction bars, PPE finned deep pan , Mike L trany cooler, PSC pump, 5100s, Sulastic Shackles, Curt com 2.5 hitch
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#8
10-15-2017, 04:08 PM
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he just kicked it around a little. He said it isn't the best situation to put the pump in, but it did last a long time, and he said there's a lot of power to be made from cold air and hot diesel. So, I figured I'd throw it around here a little and see what folks think.
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08 LMM Crew 4x4 Dipper Trans/Mark's 68mmStg2R/40 over LBZ tips Exergy 12mm
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