Yours is noisy only because you chose to install the pump in the engine compartment. Installed elsewhere, there is no noise issue. Drifto has his 044 installed in the rear, and it is very, very quiet.

 

In his case there is no benefit to running them on a switch. That would just add complexity to his system so he should run them all the time. I am just giving people who have theirs installed like mine some info I have gathered that's all.

 

come on guys.. everybody has there on theory..
but for now ill live with the sound till i have 200$ to spare for a FPR..

 

Where is your external pump located?

 

in the engine bay

 

I like this thread. I have been contemplating installing my 2nd pump in the engine compartment or somewhere in the rear......wiring seems easier having it in the engnie compartment...

it maybe good to list the merits of either location from people who have done this mod.

pics would be awesome as well.

maybe when its all said & done there is a little recipe for cooking up a in-line fuel set-up thats easy to install & cost effective.

 

The biggest problem (AFAIK) with an engine compartment install is noise. Of several OE setups that use dual pumps in series, I can think of none that have it installed there, probably for that reason (and possibly others). And FWIW, dual series pump applications (OE and otherwise) run the pumps full time, for reasons which I need not explain further.

Installing the second pump elsewhere (e.g. in the rear, in the middle, etc.) involves a little more work, but there is no noise issue. Do it that way, and discussions like this don't pop up simply because there are no issues.

 

Well maybe inside the car... Outside it's an entirely different story
I'll snap some pics of my set up and post them later. Pump is mounted on the rear differential carrier.

 

where are you getting your power for the 2nd pump when running it out back? if running a 2nd wire, did you fish it through neatly & hidden or is it ty-rapped under the car?

 

I would say that installing it under the car is less wiring and less complexity wiring wise. I had to install two relays and wire my setup to the ecu. The only con I can think of to installing it under the car is if you don't have a lift it is a tight squeeze under there. If you have access to a lift, the answer is obvious.

I would still like to see some real test results showing backpressure behind the inline pump when leaving it off. Of course then we are assuming the pressure is enough to have an adverse effect on the intank pump. I do know the Bosche pump uses a somewhat different turbine design, I am just not sure how free flowing it's when not spinning. The Bosch technician seemed to think it would flow fine even when off.

I guess time will only tell whether my walbro fails or not.

Just run a decent gauged wire straight from the battery under the car. That will give the pump max voltage. Just make sure you put an inline fuse in there (20A I think). Of course you can ground it anywhere on the chassis, just make sure it gets good contact with the metal (sand it down).

 

ok.. so i rewired the pump so it can be on all the time, and bam.. did the trick... it stopped going lean
i will snap some pics

 

Imagine that.

 

Glad you took the time to check out the alternative. Glad it worked for you. Let us know if you find any overrun at idle, or whether the return needed to be drilled out. Thanks!

 

Car is not tuned yet and it idles pretty good. For having this bosch and 1600cc injectors on stock ecu...

 

I am assuming you are on the stock ecu? It must have something to do with the stock sensor/ecu setup, because I swear, I switch from leaving it on to not leaving it on and my idle does not change.

I can try it again as an experiment and watch my fuel pressure, but I am pretty sure there is no difference at idle.