Duramax Diesels Forum Truck of the Week
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Old 10-15-2017, 11:01 AM
N2BRK N2BRK is offline
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Default 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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Old 10-15-2017, 12:21 PM
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Dvierra86 Dvierra86 is offline
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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


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Old 10-15-2017, 01:10 PM
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Turn the pressure down some or make a return line.
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Old 10-15-2017, 02:58 PM
N2BRK N2BRK is offline
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there is no turning down the pressure; it's a fixed 12lbs regulator with no adjustment.
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Old 10-15-2017, 03:44 PM
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torqued2dmax torqued2dmax is offline
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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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Old 10-15-2017, 03:55 PM
N2BRK N2BRK is offline
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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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Old 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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AFE Blade Runner ;DHD Big Air intake;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 in and out pipes by Big Foot on & off road shop ; shimmed fprv; FASS fuel system; 5/8 inch pickup; FASS fuel filter delete; EFI live, 5 position switch 250 hp big tune by Crank it up ; built SunCoast Allison 1078 converter by Limitless Diesel; Sulastic shackles;ARP head studs; grade C gaskets; tig-welded water pump ;T stats; by Blackout performance; Merchant t case brace and pump rub kit;drive shaft 1480joints Greensburg machine,BDS Recoil traction bars , 5100s
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Old 10-15-2017, 04:08 PM
N2BRK N2BRK is offline
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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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