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Author Topic: how to wire up twin boosh pumps  (Read 1623 times)

jade501

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how to wire up twin boosh pumps
« on: February 19, 2012, 08:10:28 PM »
hi i have 2 044 boosh fuel pumps in boot was woundering how to wire up do i just them up to switch but wanting to run as high as voltage as possible and dont realy want to have a switch i have to turn on everytime i start car??

westybob

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how to wire up twin boosh pumps
« Reply #1 on: February 19, 2012, 08:46:48 PM »
You need to run a heavy wire from the battery to a heavy duty (40 amp) solenoid feeding the pumps (easier if your battery is in the boot).
Run new earths from the pumps to a clean contact on the chassis.
Use the old power supply for the fuel pump to switch the solenoid and earth the other side of the solenoid.
There are several tutorials around if you want diagrams but best to keep it simple.

Stalk3r

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how to wire up twin boosh pumps
« Reply #2 on: February 20, 2012, 06:38:31 PM »
relay, not solenoid

frost.motorsport

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how to wire up twin boosh pumps
« Reply #3 on: February 20, 2012, 07:22:31 PM »
another "are you sure you have enough skill/knowledge/understanding to be fooling around inside your fuel tank??"....

However, in an effort to be slightly helpful, look here: http://www.gtr.co.uk/forum/129522-twin-tank-fuel-pump-re-wire-2.html

Oh, and it's Bosch.  Not boosh... :)  Which makes me nervous also...

oh and here's how I wired mine...

« Last Edit: February 20, 2012, 07:24:11 PM by frost.motorsport »
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Stalk3r

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how to wire up twin boosh pumps
« Reply #4 on: February 20, 2012, 10:03:36 PM »
hahahaha, you and i share many things, sense of "oh god countdown till new thread help i torched my car" incoming is obviously one of them

D1LEMA

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how to wire up twin boosh pumps
« Reply #5 on: February 20, 2012, 10:29:20 PM »
Damn dude ... Please make sure that your safe while dealing with fuel/wires etc

gtsr

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how to wire up twin boosh pumps
« Reply #6 on: February 20, 2012, 11:01:23 PM »
This thread = a whole lot of people like this -



:laugh:

Don't forget to run engine, pull fuel pump fuse to remove fuel in fuel lines, etc before doing any work on fuel system. Also remove tank cap.

live4liners

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how to wire up twin boosh pumps
« Reply #7 on: February 20, 2012, 11:35:58 PM »
remove tank cap very good idea.
pulling fuses while engine running.....

if you cant do it, and your mates cant do it, your old man cant help, id pay somebody. what frost gave you is a very good diagram. the battery while the cars running should be more like 14v though.
i would prefer to use the 12v line from the ecu, and earth the relay to battery, that way if you have an accident or the like, the fuel pump cuts off like it should. there is a disadvantage to this way, but might as well give you all your options.

Stalk3r

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how to wire up twin boosh pumps
« Reply #8 on: February 20, 2012, 11:45:23 PM »
the line from the ecu is a ground, so you HAVE to do it the way his image shows

his diagram is perfect, follow it

AGRORB

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how to wire up twin boosh pumps
« Reply #9 on: February 21, 2012, 12:25:02 AM »
My thought is, do you need twin fuel pumps? Bosch 044's are pretty grunty on their own...
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live4liners

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how to wire up twin boosh pumps
« Reply #10 on: February 21, 2012, 12:31:16 AM »
so where does the 12v line to the fuel pump currently come from? because there is definately a + and - going to mine :p

AGRORB

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how to wire up twin boosh pumps
« Reply #11 on: February 21, 2012, 12:55:29 AM »
12v would be a wire from ignition switch wouldnt it? Whereas the negative would be from the pump relay and ECU? Or should I just stfu and stop thinking? :p
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live4liners

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how to wire up twin boosh pumps
« Reply #12 on: February 21, 2012, 01:29:16 AM »
the 12v is from the ecu. at least it is on my car. i had trouble working out which one it was because as soon as the pump was primed, the ecu cut the power, and i couldnt find a 12v feed until i started the engine. for this reason, as i kind of say above. i would use the 12v line for the relay.
hell, i dont see why you wouldnt just use both of the original wires from the fuel pump for the relay. unless you wanted the relay in the front of the car.

westybob

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how to wire up twin boosh pumps
« Reply #13 on: February 21, 2012, 07:30:00 AM »
Apart from calling a relay a solenoid my other mistake would be earthing the solenoid whereas it should be earthed through the ecu. Mr Frost's diagram explains it very clearly.

frost.motorsport

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how to wire up twin boosh pumps
« Reply #14 on: February 21, 2012, 10:09:33 AM »
the ECU feed is actually an earth (ECU's generally don't supply voltage!!  much easier to switch to ground) - it comes from the plug (on an R33 at least) behind and to the left of the main fuse/relay/feed block to the right of the battery (the pic in the link in my post above should show it).  Basically I traced the FPR wiring back to this.  I think it was a brown/white wire IIRC.  

Use this feed to earth/switch the low-amp side of your spanky new relay, and the  switched side then delivers a nice fat +12v (or whatever voltage your battery/alt are producing!! smart-arse....) to your pump, then back to a nice, clean earth on the chassis (with a similarly fat bit of wire)

And remember kids, your earth needs to be at least as big a gauge wire as your feed!  Too many times I've seen people put massive positive feeds to a circuit only to use speaker wire to earth it.... Durr!
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