MHD Fuel Pump toggle switch

grebski · 02-19-2016, 07:21 PM

So I got tired of being paranoid about the battery dying during a flash. I ended up pulling the fuel pump fuse bur got tired of Reinserting the fuse.

I ended up building this. It's a toggle switch that in series with the fuel pump fuse. turn the switch off to disable the fuel pump. flash and turn it back on.

I used a fine jumper. 35A switch and 20A fuse. $10 later we have this ghetto contraption that works flawlessly.

N54Society · 02-21-2016, 04:22 AM

I can appreciate that. This man is making contributions. Show some appreciation guys.

And you're from San Diego!

TGNY 335 · 02-21-2016, 07:20 AM

yea , I agree pulling fuses in there can get old. good stuff.

Velocity26 · 02-21-2016, 08:21 AM

Would also be a pretty stealth immobilizer if hidden properly.

grebski · 02-21-2016, 08:43 AM

Quote:

Originally Posted by Velocity26

Would also be a pretty stealth immobilizer if hidden properly.

it actually actually works well as one

MHD Tuning · 02-21-2016, 02:18 PM

Need one badly!

3000GT MR · 02-22-2016, 07:44 AM

You should probably look into getting a battery if your worried about a 10amp draw for 2m30s. Unless your doing full writes all the time for no reason.

grebski · 02-22-2016, 01:38 PM

Quote:

Originally Posted by 3000GT MR

You should probably look into getting a battery if your worried about a 10amp draw for 2m30s. Unless your doing full writes all the time for no reason.

I agree but it's a super cheap insurance policy for a faulty battery or if your alternator isn't working properly

mwahlert · 02-25-2016, 01:13 PM

Can't understand the purpose of the fuel pump running during the write to begin with...

grebski · 02-26-2016, 09:39 AM

Quote:

Originally Posted by mwahlert

Can't understand the purpose of the fuel pump running during the write to begin with...

I don't either but it has to be part of the re-coding logic. Doubt there is anything they can do about it unfortunately.

Red_Bean_Bun · 02-26-2016, 09:47 AM

That is one very useful switch ....

RicaIii · 01-11-2017, 11:18 AM

Hi..i ama new user here. I am also facing one issue i was wondering if i could hook up my fuel pump directly to the battery and a toggle switch in the middle so i can run my fuel pump since there is a problem between the ignition and the fuel pump. i know its a lazy way to do it but i just want to be able to move my 7 around and get my other cars in my garage. so are there any write ups about this or any advice you guys can give me ?

Sshec152 · 01-11-2017, 12:26 PM

Our cars use pwm to make the correct fuel pressure not an external fpr so no that wouldn't work

01-12-2017, 10:40 AM

Quote:

Originally Posted by RicaIii

Hi..i ama new user here. I am also facing one issue i was wondering if i could hook up my fuel pump directly to the battery and a toggle switch in the middle so i can run my fuel pump since there is a problem between the ignition and the fuel pump. i know its a lazy way to do it but i just want to be able to move my 7 around and get my other cars in my garage. so are there any write ups about this or any advice you guys can give me ?

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02-19-2016, 07:21 PM	#1
grebski Honey Badger 28 Rep 321 Posts Drives: 2007 E92 335i Join Date: Aug 2014 Location: San Diego iTrader: (6)	MHD Fuel Pump toggle switch So I got tired of being paranoid about the battery dying during a flash. I ended up pulling the fuel pump fuse bur got tired of Reinserting the fuse. I ended up building this. It's a toggle switch that in series with the fuel pump fuse. turn the switch off to disable the fuel pump. flash and turn it back on. I used a fine jumper. 35A switch and 20A fuse. $10 later we have this ghetto contraption that works flawlessly. Attached Images
	Appreciate 4 Tweet Quote

02-21-2016, 04:22 AM	#2
N54Society Major Private First Class 488 Rep 1,327 Posts Drives: 2010 E90 335i M Sport Join Date: Mar 2014 Location: US, NA, Earth, Milky Way Galaxy iTrader: (2)	I can appreciate that. This man is making contributions. Show some appreciation guys. And you're from San Diego! __________________ 2008 E92 335i 6MT: FBO + MMP Silicone Inlets \| Stage 1 LPFP \| 335is clutch + MFactory SMFW \| Custom BuraQ + MHD tune \| 3.5Bar N20 sensor [SOLD] 2010 E90 335i M-Sport AT: 5" Stepped FMIC, Stage 2 LPFP - MHD V7 E60 Tune running 100% E85 - VRSF DPs
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02-21-2016, 07:20 AM	#3
TGNY 335 Banned 196 Rep 212 Posts Drives: 2007 335xi 6MT Join Date: Nov 2015 Location: US iTrader: (0)	yea , I agree pulling fuses in there can get old. good stuff.
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02-21-2016, 08:21 AM	#4
Velocity26 Resident old fart 147 Rep 575 Posts Drives: 2010 335i M-Sport Join Date: Oct 2011 Location: Florida iTrader: (4)	Would also be a pretty stealth immobilizer if hidden properly.
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02-21-2016, 02:18 PM	#6
MHD Tuning Banned 1998 Rep 345 Posts Drives: M3F80#M5F90#340iF31#SupraA90 Join Date: Feb 2015 Location: Germany iTrader: (0)	Need one badly!
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02-22-2016, 07:44 AM	#7
3000GT MR Major 277 Rep 1,392 Posts Drives: 09 335i/3000gt vr4 Join Date: Jun 2012 Location: Sav GA iTrader: (6)	You should probably look into getting a battery if your worried about a 10amp draw for 2m30s. Unless your doing full writes all the time for no reason. __________________ Have a single turbo and/or tired of burning up O2 sensors? Ask me about the new ADV O2 sensor retro kits! 335i 2010 e92 M-sport Mods: VM Top mount 6466, Aquamist HSF4 w/custom direct port. VRSF IC + Exhaust 335i 2009 e90 665RWHP VFF900 ST RIP .
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02-25-2016, 01:13 PM	#9
mwahlert Lieutenant Colonel 104 Rep 1,659 Posts Drives: 2009 335i Join Date: Apr 2008 Location: NC iTrader: (8)	Can't understand the purpose of the fuel pump running during the write to begin with...
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02-26-2016, 09:47 AM	#11
Red_Bean_Bun Captain 65 Rep 945 Posts Drives: E92 Join Date: Nov 2009 Location: Montreal iTrader: (4)	That is one very useful switch ....
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01-11-2017, 11:18 AM	#12
RicaIii Registered 0 Rep 1 Posts Drives: Chervolet Join Date: Jan 2017 Location: New iTrader: (0)	Hi..i ama new user here. I am also facing one issue i was wondering if i could hook up my fuel pump directly to the battery and a toggle switch in the middle so i can run my fuel pump since there is a problem between the ignition and the fuel pump. i know its a lazy way to do it but i just want to be able to move my 7 around and get my other cars in my garage. so are there any write ups about this or any advice you guys can give me ?
	Appreciate 0 Quote

01-11-2017, 12:26 PM	#13
Sshec152 Private First Class 45 Rep 160 Posts Drives: 2007 335i coupe Join Date: Jun 2015 Location: Delaware county iTrader: (0)	Our cars use pwm to make the correct fuel pressure not an external fpr so no that wouldn't work
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