question about using a walbro inline fuel pump in place of2nd pump on mk2, (any input from vrt/1.8t guys welcome)

[smugfree3]

no response from the mk2 guys:

i coming close to finishing up my 1.8t swap. on the last car i did, i just put the walbro after the 2nd fuel pump,
but for the sake of cleanliness, can i just use the walbro in place of the secondary pump?
is there any way that a walbro fits in the accumulator? or can i just go from intank pump->filter->walbro->motor?

im just worried that if the accumulator acts as something of a surge tank then wont the walbro outrun the intank pump and ill lose fueling capacity? if it helps to know, the motor is on a bigger turbo with 440's for injectors.

[screwball]

The closest I've heard of people running inline's in conjunction w/ an intank is at the stock filter location by the rear wheel (on MK4s at least) and they'll throw the filters in the bay by the timing belt cover. Personally I run a TT pump w/ a non 044 Bosch inline up in my engine bay. I'm pushing 400wheel and I've never had a lean out condition that was pump related. I even killed my stock intank pump and while I wasn't boosting the crap out of the car until it was fixed, all was well.

[FlatlanderSJ]

I have my vrt corrado running intank > walboro > filter > motor. the walboro was mounted next to the fuel filter in the rear. Running 22lbs on a 35r @4bar fpr and never had problems leaning out. remember when you decrease pressure on a pump the flow rate increases.

[Capt.Dreadz]

I run mine Intank>filter>Pump>motor. I hate to think my 044 is sucking up dirty fuel.

And to answer you question...no, you can't fit the walbro in the stock location. I thought about it myself. If you're looking for a semi submerged setup, IE sells a dual & single surge tanks.

[JettamiahMKIV]

what about a 255lph alone intank? intank >filter>motor?

[Capt.Dreadz]

what about a 255lph alone intank? intank >filter>motor?

2 intanks?

[HidRo]

2 intanks?

what about a 255lph alone intank?
intank >filter>motor?

I think this way makes more sense?
I'm not sure, but the CIS intank pump can handle a 255lph "sucking" from them, so it's a + to have both, and I've read also that the fuel filter should be after as the 255lph it better at pushing than pulling fuel.

[Nevaeh_Speed]

I have the stock mk2 intake, and a fuel filter right before the 255lph pump... Works fine. You just need to relay the 255lph as the stock harness to the second pump doesn't allow as much volts to make the pump work as it should. I used the stock harness to the old 2nd pump as the trigger wire and ground. Makes the job super easy.

[kevinmacd]

i have a stock mk2 tank and brand new in tank supplying an 044 in the stock location then a factory filter to the motor. I also use the mk5 fuel pump control module to supply variable voltage to the 044 as per the 2.o fsi ecu. never had an issue running lean on my stage 3+ 2.0FSI

[MEKA NECK]

[QUOTE=Nevaeh_Speed;75995422]You just need to relay the 255lph as the stock harness to the second pump doesn't allow as much volts to make the pump work as it should. QUOTE]


Any more info on what you mean by doing this?

[FlatlanderSJ]

[QUOTE=MEKA NECK;77008499]

You just need to relay the 255lph as the stock harness to the second pump doesn't allow as much volts to make the pump work as it should. QUOTE]


Any more info on what you mean by doing this?

just add a relay with the signal wire attaching to the power from the in tank pump and the power coming directly from the battery.

[BarryV]

You just need to relay the 255lph as the stock harness to the second pump doesn't allow as much volts to make the pump work as it should.

Any more info on what you mean by doing this?

The harness that goes to the factory inline pump under the car has 4 wires - 2 are red and yellow, and 2 are brown. The browns are your ground, and I wired the ground for the relay, and the pump into those, using butt connectors. The yellow and red are your original 12 V feeds to the fuel pump. I cut those and butt connected the "relay signal" into them.

When your car tells your in-tank and in line pumps to turn on, from the under dash relay, that 12 v signal is now used to tell the aftermarket relay under the car to push the 30A 12V direct feed to the Walbro.

[Daskoupe]

I have not relayed my walbro.Thinking i should though

[01ttgt28]

C2 motor sports sells a awesome kit for the walbro it connects to all the factory lines
I ran mine Apr in tank and inline walbro then a filter

[HidRo]

If you do not replay it, what can happen?
I had Megasquirt connected to the output of the fuel pump relay, and I saw a bit of a drop in voltage. Minimum I've seen was like 12V. So, is this bad for the walbro? Will it not work as perfect as it should?
How many lph can the walbro do @12v? For how many hp is it good for?

[Jones84]

Here is my Walbro set up on a mk2 in the stock pressure pump loction. Still running stock intake pump. I have pushed 25psi on 680cc injectors with out any issues.

[HidRo]

And this connected to the stock power connection? No relay of any kind?

[Jones84]

Yes, all stock. I have never had any problem with it at all in the 2 years its been in.

[Nevaeh_Speed]

You need to relay the fuel pump as the fuel pump works best at 14.4v, and if you test the oem wire from the bottom fuel pump you get much less voltage, thus you relay it. Also I have the fuel filter on the inlet side of the 255 not the out as stated in the walbro instructions.

[Jones84]

You need to relay the fuel pump as the fuel pump works best at 14.4v, and if you test the oem wire from the bottom fuel pump you get much less voltage, thus you relay it. Also I have the fuel filter on the inlet side of the 255 not the out as stated in the walbro instructions.

Interesting, Its is a 12v pump and a alt is regulated to only put 13.5v to the car max. So not sure were you would get 14.4v from. Its Amps not volts that make it run better. 12v and 100amp will make it work great. were as 12v and 20amp it wont turn on. Not enuff power.
All a relay does is take the load of the AMPS not volts. The car has a Stock FP relay in the fues block just for that reason.
I am running a bosh 044 of the stock set up in my MK1 and have installed 5 walbros in customer cars all using the stock FP relay. I have never ever had any issues with the pump not working correct..

[HidRo]

Thanks for the information Jones!
Cheers!