Fuel Pump pressure question

**GOLFBALLS** · 18-05-2010, 04:24 PM

Gidday.
Can anyone tell me if the mk2 GTI fuel pump for the RV engine (digifant II) is 3 bar or 4 bar??
The number of the pump is 191 906 090.

Cheers,
Wade

**velly_16v_cab** · 18-05-2010, 09:11 PM

i think its 4 bar but the fuel regulater will drop it down...i know the perfance high pressure regs are 3.5 bar! (so i would guess the the fuel pump would pump harder and the regulater will drop it down)

**h100vw** · 18-05-2010, 10:08 PM

You need to consider flow, as much as pressure Wade. 4BAR to supply a 100hp motor, is a fair bit less fuel than 4BAR to run a 300hp motor.

Cheers

Gavin

**NeuSpeedGTI** · 19-05-2010, 01:31 PM

Gavin,

Got myself an adjutable regulator, and looking at taking it from the stock 3bar to 3.5 possibly more once I add the 735i AMM. A 4 bar fuel pump is good to _____ hp?

Cheers,

James

**GOLFBALLS** · 19-05-2010, 01:31 PM

Ok thanks.
I'm a bit unsure what to do. Do i leave the old mk2 pump setup there and feed the AMK with that? Or is it too weak and should i get the VR6 setup?

I still have the old S3 pump, and was hoping maybe i could put the actual S3 pump in the mk2 housing??? I'm really stuck???!!!

**jayjay** · 19-05-2010, 06:48 PM

i'm running with a vr6 tank and in-tank pump at the moment. i wouldn't worry so much about a vr6 pump under-fueling, but perhaps the original digi pump might struggle a bit.

considering the injectors for the stock 8v are less than 200cc, and the tt 225 injectors ( same as AMK?) are something like 315cc, flow rate might be an issue with the stock pump.

i'd fit the vr6 pump just to be sure.

edit: dont think the s3 pump will fit in housing, never tried, who knows?

**h100vw** · 19-05-2010, 07:29 PM

Wade, go through ETKA. See what tank is in the G60 Golf GTI PG engine code, if that has the same part number as one for a digifant Golf PB engine code. You will be game on with the VR6 pump. I broke the pump in my G60 and used a VR6 one as a replacement.

Gavin

**roccodingo** · 19-05-2010, 07:37 PM

just get it running with what you have Wade, then mess about with the pump if it isnt up to scratch.. the Std K jet will flow enough to get it idling at a bare minimum.

**h100vw** · 19-05-2010, 07:45 PM

I forgot it was Kjet, easy to get a Bosch 044 I think it is and bolt in in the same place as the original. You need that wideband so you know it hasn't gone lean. Be a shame to wreck the motor over a fuel pump.

Gavin