Meth trunk tank question

335xi Kevo · 01-12-2013, 10:23 AM

Hey Guys,

I've been reading a few threads regarding this. Converting the PWM kit to run in the trunk seems pretty easy. Several guys here have left the pump in the bay and have the system pull the fluid from the trunk.

One user posted data here showing that he noticed a marginal drop in flow.

My question is, if I fail to relocate the pump and extend the lines to the trunk will the actual longevity of the pump be in question? Should I install a check valve along the way?

Also has anyone else logged the flow rates other then 1 user? I may be a guinea pig.

caliguy562 · 01-12-2013, 11:36 AM

So much easier to do right the first time. These pumps are gravity feed and work best when located under the tank. You already have to run the meth line, just extend the power wire, as well and put the pump in trunk as well. You will have less headaches down the road. Even with a check valve, it is possible for air to enter the line...faultly valve or point from pump to checkvalve.

335xi Kevo · 01-12-2013, 06:23 PM

Well I have to say I installed the tank only today and ran the lines. I left the system set-up so I could easily move the pump back there if need be. I noticed ZERO change in performance other then a very long air purge. I post a pic of my set-up and custom bracket later.

335okc · 01-12-2013, 10:46 PM

make sure you log them. i left my pump in the front and the performance was poorer than when i used WW tank. when i moved the pump to the trunk, below the tank, i got a WHOLE lot more spray and more consistent flow.

01-12-2013, 10:23 AM	#1
335xi Kevo Lieutenant 26 Rep 497 Posts Drives: 2008 335xi Join Date: Jan 2012 Location: CT iTrader: (3)	Meth trunk tank question Hey Guys, I've been reading a few threads regarding this. Converting the PWM kit to run in the trunk seems pretty easy. Several guys here have left the pump in the bay and have the system pull the fluid from the trunk. One user posted data here showing that he noticed a marginal drop in flow. My question is, if I fail to relocate the pump and extend the lines to the trunk will the actual longevity of the pump be in question? Should I install a check valve along the way? Also has anyone else logged the flow rates other then 1 user? I may be a guinea pig. __________________ 08' 335xi 6MT Space Metallic Grey Premium, Nav, Cold weather, Sport Procede 2.5, DCI, Forge DV, PWM, Scoops, KW V1, ETS 5" FMIC, VRSF Downpipes, M3 Skirts
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01-12-2013, 11:36 AM	#2
caliguy562 Lieutenant 8 Rep 476 Posts Drives: E92 335i Join Date: Dec 2007 Location: garaged somewhere in soCal iTrader: (3)	So much easier to do right the first time. These pumps are gravity feed and work best when located under the tank. You already have to run the meth line, just extend the power wire, as well and put the pump in trunk as well. You will have less headaches down the road. Even with a check valve, it is possible for air to enter the line...faultly valve or point from pump to checkvalve.
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01-12-2013, 06:23 PM	#3
335xi Kevo Lieutenant 26 Rep 497 Posts Drives: 2008 335xi Join Date: Jan 2012 Location: CT iTrader: (3)	Well I have to say I installed the tank only today and ran the lines. I left the system set-up so I could easily move the pump back there if need be. I noticed ZERO change in performance other then a very long air purge. I post a pic of my set-up and custom bracket later. __________________ 08' 335xi 6MT Space Metallic Grey Premium, Nav, Cold weather, Sport Procede 2.5, DCI, Forge DV, PWM, Scoops, KW V1, ETS 5" FMIC, VRSF Downpipes, M3 Skirts
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01-12-2013, 10:46 PM	#4
335okc Captain 42 Rep 659 Posts Drives: e90 335 Join Date: Feb 2011 Location: okc iTrader: (0)	make sure you log them. i left my pump in the front and the performance was poorer than when i used WW tank. when i moved the pump to the trunk, below the tank, i got a WHOLE lot more spray and more consistent flow.
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