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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > MHD Fuel Pump toggle switch



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      02-19-2016, 09:21 PM   #1
grebski
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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.
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      02-21-2016, 06:22 AM   #2
vbp6us
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I can appreciate that. This man is making contributions. Show some appreciation guys.

And you're from San Diego!
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      02-21-2016, 09:20 AM   #3
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yea , I agree pulling fuses in there can get old. good stuff.
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      02-21-2016, 10:21 AM   #4
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Would also be a pretty stealth immobilizer if hidden properly.
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      02-21-2016, 10:43 AM   #5
grebski
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Quote:
Originally Posted by Velocity26
Would also be a pretty stealth immobilizer if hidden properly.
it actually actually works well as one
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      02-21-2016, 04:18 PM   #6
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Need one badly!
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      02-22-2016, 09:44 AM   #7
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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.
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      02-22-2016, 03:38 PM   #8
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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
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      02-25-2016, 03:13 PM   #9
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Can't understand the purpose of the fuel pump running during the write to begin with...
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      02-26-2016, 11:39 AM   #10
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Quote:
Originally Posted by mwahlert View Post
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.
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      02-26-2016, 11:47 AM   #11
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That is one very useful switch ....
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      01-11-2017, 01:18 PM   #12
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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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      01-11-2017, 02:26 PM   #13
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Our cars use pwm to make the correct fuel pressure not an external fpr so no that wouldn't work
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      01-12-2017, 12:40 PM   #14
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Quote:
Originally Posted by RicaIii View Post
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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