Today I fitted an inline fuel pump, in the hope of sorting out my lean condition on full boost. Whilst the intank pump is more than capable of the flow, it seems the added stress of a 4 bar fpr had pushed it to it's limit and it wasn't keeping rail pressure high enough on full boost. Yet another reason why we all advise against a 4 bar FPR, they're just not cool!
Here's all the kit I got together to start the install:
I found this pic on google images, drawn by our own HTC (Kev) many years ago! Was most handy for an electrical simpleton like me!
I backed the car up on the ramps to gain access to the fuel filter area, where I planned to install the pump:
Started off with some simple wiring up a relay:
In-line fuse holder added:
Relay mounted to an existing hole, tucked away from the load area so it shouldn't get knocked at all:
To trigger the relay, I spliced into the OE pump 12v feed:
I used petroleum jelly on all the crimped joints, just to ensure a really good contact:
I used one of the cage leg bolts as a good secure earthing point, scraped all the paint away, and coated it in petroleum jelly again to ensure a good contact:
I then ran the wires down through 2 ideally placed gromits, to the underside of the car.
That's the wiring inside finished:
The 044 type pump has threaded ends like this:
Thankfully, Bill makes some really handy fittings which replicate the end of the OEM fuel filter, so the pump can be installed using the stock fuel lines and clips:
Fittings on:
Lots of people find these pumps really noisey, and I wanted to avoid that, so I dug through my box of old silicon, and found a 63mm pipe was almost the ideal size to wrap around the pump. I cut a slot in it and took 5mm out of the gap so it'd close up tight:
Then it was just a case of sliding the pump into place and connecting the terminals. The pump secures in the OE way using the OE fuel filter bracket:
And finally, as the fuel filter has now gone from it's stock location, a new filter needs to be added.
You can put the stock filter in the engine bay, but it's ****** huge, so I've used an Ibiza cupra filter on Bills recommendation, spliced into the feed line to the fuel rail:
And job finished!
Back on the ground, ignition on, nothing from the pump
D'oh!
Checked the relay was clicking, checked all the wiring, still nothing.
Oh wait, I wonder if the inline fuse holder comes with a fuse already fitted?
ohps! haha.
fuse fitted, and it jumped into life
It's audible, but nowhere near as loud as some I've heard, you can just about hear it on tickover, and once moving, you wouldn't hear it at all.
AFR's are now rock solid, and if anything, slightly too rich! I think I'll have to get some boost dialled in at the top end to make use of all the fuel available