Installing Mp9 Fuel pump?

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G-Hopper
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Installing Mp9 Fuel pump?

Post by G-Hopper »

Just want to check i have my fuel lines set up correct? I have the mp9 pump with one 8mm nozzle coming out the front of the pump and at the back another 8mm nozzle and a 15mm nozzle. As far as i know, the 8mm in the front goes to fuel rail in. The 8mm at the back is from fuel rail return and the 15mm is tank to pump. Is my setup correct?
1.6carbster
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Re: Installing Mp9 Fuel pump?

Post by 1.6carbster »

doesnt sound right

here's a pic of mine if it helps
Image

Current:
2005 BMW 330i (E90) The Beef
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1999 Audi A4 1.8T (AEB) the tank
1992 VW Citi 1.8i MP9 R.I.P.
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G-Hopper
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Re: Installing Mp9 Fuel pump?

Post by G-Hopper »

As per pic above, pipe on right goes to fuel rail in. Then there are two pipes on the left. The thick one goes to the tank and the thin one is the return from the fuel. Therefore there's only one pipe coming out of the tank which is the thick one. Is this correct?
UDC
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Re: Installing Mp9 Fuel pump?

Post by UDC »

IIRC the actual fuel return coming from the fuel rail goes straight to the tank at the top, where the fuel gauge sender is.
The fuel pump has 2 inputs and 1 output.
The thick pipe at the bottom of the tank goes into the 15mm input on the pump.
Then theres another thinner pipe more towards the top of the tank at the top corner I think that goes into the 8mm input of the pump.
G-Hopper
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Re: Installing Mp9 Fuel pump?

Post by G-Hopper »

hi i'm slowly getting there. I'm converting a caddy tank to mp9 so its not the same as a golf. Got the output of the pump to the fuel rail. Got the thick input from bottom of tank to input. I know thats correct cause it pumps. Now what to do with the smaller input? My options: Fuel rail return to small input or both fuel rail return and small input to tank? Which option?
UDC
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Re: Installing Mp9 Fuel pump?

Post by UDC »

G-Hopper wrote:both fuel rail return and small input to tank?
G-Hopper
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Re: Installing Mp9 Fuel pump?

Post by G-Hopper »

Ok. Sorry so many questions but now one more. Why then two inputs a small and a big one? Why not just use the big one?
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Re: Installing Mp9 Fuel pump?

Post by UDC »

this is a guess, but I think its a return for the fuel pump.
G-Hopper
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Re: Installing Mp9 Fuel pump?

Post by G-Hopper »

Thanks N e one know forsure?
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Re: Installing Mp9 Fuel pump?

Post by Gerard »

There are 3 fuel connections on that pump - 1 in front & 2 at rear.

In front
1.) single 8mm connection - 8mm supply to fuel rail

At rear
1.) 13mm connection - supply from fuel tank to pump
2.) 8mm connection - this is also a return - from fuel pump to tank via the petrol float (6mm)

The second 8mm fuel line under the car is a return from the fuel rail, which runs into the tank, more or less in the same vicinity as the 13mm supply. You will see (through the open float mount position) that this 8mm return runs directly into the baffle which feeds the 13mm supply.
Last edited by Gerard on Wed Aug 20, 2008 3:16 pm, edited 1 time in total.
G-Hopper
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Re: Installing Mp9 Fuel pump?

Post by G-Hopper »

Thanks alot got it
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Re: Installing Mp9 Fuel pump?

Post by G-Hopper »

So can i join the return from the pump and the return from the fuel rail with a T-piece and then into the tank at the bottem. Got a Caddy so i don't have the return on top at the float
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Armand
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Re: Installing Mp9 Fuel pump?

Post by Armand »

G-Hopper wrote: Wed Aug 20, 2008 4:17 pm So can i join the return from the pump and the return from the fuel rail with a T-piece and then into the tank at the bottem. Got a Caddy so i don't have the return on top at the float
Did this work?
Current:
2011 Black 6R Polo Gti (Forge intake, Viper dp, Stage 2 DNA sw)
Ex:
2007 Polo gti (Giac software, 76mm dp, ITG Induction, custom FMIC)
2009 Citi 1.4i sport
1997 Uno turbo ( w/m, Tdo4 turbo, intercooler,76mm exhaust
Bmw 540i e34 (Standard)
Nissan 3.0 v6 (Brospeed branches and exhaust)
2009 Polo gti (Giac software)
Suzuki gsxr1000 k5 (Everything)
Vw caddy club (Mp9 conver, Branches, exhaust, chip)
Ashveer03
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Re: Installing Mp9 Fuel pump?

Post by Ashveer03 »

Come on dude, see the dates. That was 10 years ago.

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When a car tailgates me, i slow down - then floor it and give them a cloud of diesel smoke to choke on :driving:
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Armand
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Re: Installing Mp9 Fuel pump?

Post by Armand »

Ashveer03 wrote: Wed May 16, 2018 2:22 am Come on dude, see the dates. That was 10 years ago.

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I am sure someone else mustve done it in the last 10 years that can confirm if it worked or not
Current:
2011 Black 6R Polo Gti (Forge intake, Viper dp, Stage 2 DNA sw)
Ex:
2007 Polo gti (Giac software, 76mm dp, ITG Induction, custom FMIC)
2009 Citi 1.4i sport
1997 Uno turbo ( w/m, Tdo4 turbo, intercooler,76mm exhaust
Bmw 540i e34 (Standard)
Nissan 3.0 v6 (Brospeed branches and exhaust)
2009 Polo gti (Giac software)
Suzuki gsxr1000 k5 (Everything)
Vw caddy club (Mp9 conver, Branches, exhaust, chip)
-=sT3V3=-
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Re: Installing Mp9 Fuel pump?

Post by -=sT3V3=- »

lol, it does work.
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