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    Thread: Inline walbro fuel pump question(wiring)

    1. Member
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      09-13-2012 12:16 PM #1
      I'm getting ready to install a new inline fuel pump on my mk2 vr6. On the fuel pump there appears to be only a + and a - , however on the old leaky fuel pump under the car it appears to be a four wire connector...??

      I have been told this is fairly straight forward to do. Any help would be huge!
      Thanks!

    2. Member Scrubbs's Avatar
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      09-13-2012 02:01 PM #2
      4 pin under the car? Pics? or is it a 4 wire 2 pin?

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      09-13-2012 03:15 PM #3
      That's a good question... I just looked under quick his morning I will check it out better tonight.
      Thanks!

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      09-13-2012 10:52 PM #4
      I checked it out, it's a two pin, there's two brown and one red and one red with yellow stripe. I'm assuming just join the reds and join the brown (ground) and that's it?

    5. Member Scrubbs's Avatar
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      09-14-2012 01:55 PM #5
      Yep, they spead the load over the wires, it was an easy design change. Saved them from redoing the harnesses for specific models. Make good crimps and connections, its the lifeblood for boosted cars.

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      09-14-2012 04:31 PM #6
      Ok thanks!! I'm just goin NA for now, this is the second mk2 I've had fuel pump failure but it seems stupid not to replace it with one of these walbros, especially considering I swapped in a vr. I spent a long time building it and finally got her running and what next? Fuel leaking... So im yet to take it for a rip, can't wait!
      Thanks again!

    7. Member Scrubbs's Avatar
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      09-16-2012 11:53 AM #7
      The stock pumps last a long time, its the in tank lift pump that causes the problems. When it starves the main pump, the main takes alot of abuse.

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      09-18-2012 12:03 PM #8
      As far as I know my mk3 only has the pump underneath and not in tank pump

    9. Member Scrubbs's Avatar
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      09-19-2012 12:03 PM #9
      Mk2's had 2 pumps, lift pump in the tank, and high pressure in the "surge/accumulator box" underneath. Mk3's had one, in tank. Did you change the tank? Is this on a Mk2 or 3? or the Corrado?

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      09-19-2012 11:28 PM #10
      Its a mk2 vr6, original fuel tank... Didn't think there was a pump in it. Either way the one underneath is leaking and I'm replacing it with the inline walbro one which should fix everything, correct?

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      09-20-2012 05:04 PM #11
      Probably should spend a couple extra bux on the lift pump also. Or search and find the in tank install of that pump. SOmeone did it, might not be the exact pump, but same style i believe. What is actually leaking? the pump seal or the lines? the accumulator?

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      09-21-2012 08:55 AM #12
      Not really sure where it was leaking from... I have future plans of a turbo so I need this pump. I thought it was only the 16v that had two pumps... The intank pump is accessed thought the trunk correct? I'll have to take a look.

      I had planned to just rip off the big boxy old pump underneath, make a bracket that I can bolt the walbro to and a fuel filter on, hookup the lines and wire it and its done?

    13. 09-25-2012 09:31 AM #13
      I've seen em mounted right in the engine bay too... that said, I mounted mine right where the old one was, like you're planning.

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      09-27-2012 09:23 AM #14
      Rsstolz, what did you do with the intank one?

    15. 09-27-2012 11:00 AM #15
      mine didn't have one.

      If I remember correctly, and I may not, some cars do and some don't. Much like all VAG cars, they can't just keep it simple, they must confound us at every turn. I would have to look back at the bentley to be certain but it was either a difference with the GTIs or because the car was fuel injected instead of carbureted.

      Even if it does have one, as long as it still works you can mount the new pump ahead of the surge tank, which mine did have, and you should be fine.

      in tank pump feeds the surge tank, in-line pump pulls from the surge tank and feeds the engine. this will allow the in tank pump to prime the system, and keep it from becoming a bottleneck in the system. Without the surge tank, the walbro pump will suck fuel faster than the in-tank pump can supply it. In this case it will supply fuel at the correct pressure, but maybe not at the correct volume.

    16. Member Scrubbs's Avatar
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      09-27-2012 12:27 PM #16
      http://forums.vwvortex.com/showthrea...fuel+pump+tank
      Check that out and see if it is what your interested in. i believie its been done with a walbro inline too. It wouldnt need the surge tank as much, but it will be noisey when fuel is low. That would be my concern, low fuel cavitation on acceleration or decel.

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      09-28-2012 11:33 AM #17
      That would be easier than what I was thinking I guess. I'm gonna clean out my trunk and see if I have an intank pump and go from there. Where is the surge tank located?
      Thanks for the help by the way

    18. 09-28-2012 04:04 PM #18
      between the in-tank pump and the external pump. should just look like a canister with a line in from the tank, and a line out to the external pump.

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      09-28-2012 08:47 PM #19
      black box under the rear passenger seat, under the car. the main fuel pump is screwed into the back side of it. Accumulator and filter is mounted to the sides of the pump, on the outside of the box. I have one sitting outside, ill shoot pics tomorrow.

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      09-29-2012 06:03 AM #20
      So i looked, took out the intank pump. The walbro appears too big to make work like that guy did . So I either need to buy the pump he used or do what originally planned and put it underneath. I couldn't see any surge tank unless its part of that whole accumulator box thing...

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      09-30-2012 11:45 AM #21
      I would suggest checking the load on your factory fuel pump wiring, whenever I installed a 195 or 255 I always relayed it with thick gauge wires or even put a dash switch. Make sure there is a new filter before the pump, I always installed mine closest to the tank, and you can use the tank pump as a feeder, but make sure your tank pump is unrestricted because walbros suck like a working girl right before Xmas.
      Last edited by JoL; 09-30-2012 at 11:51 AM.

    22. 10-01-2012 12:00 PM #22
      surge tank = fuel accumulator. different terms, same thing.

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      10-01-2012 02:15 PM #23
      Oh ok I see. So I have an intank one that appears fine...I will leave it. I have the accumulator box with old fuel pump and everything underneath still. I'm still trying to figure out my best route here.

      I'll have to take a better look but is it possible to remove the old pump from that whole setup an replace it with the walbro one and still keep the factory surge tank and bracket and everything? Obviously it will need a bit of modding to mount.

      Is it possible to just buy a mk3 style walbro and Ditch the surge tank and everything underneath? Or does that mean I have to swap gas tanks too...

      This is tougher than I originally thought but I'm trying to figure out the easiest, most practical and clean looking option.

    24. Member Scrubbs's Avatar
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      10-01-2012 07:28 PM #24
      Since you have the pump already, ditch the box, run appropriate fuel injection fuel line for the return and feed, to the pump , use a mk3 fuel filter bracket and filter, and run that to the existing line. And replace the intank pump, there cheap. They cause the mains to fail usually.

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      10-02-2012 07:36 AM #25
      If I do that I'm back to not having a surge tank? The return line runs from the fuel rail basically all the way to the intank pump I believe? And the feed line from the intank (ill buy a new oem one) - to filter - to inline pump - to fuel rail?

      I dug out the old Bentley for the mk2 but there's not much that you guys haven't already helped me with In there. I snapped a couple pics of the accumulator box I will throw up this morning.

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