Fuel Pump Direct Feed Rewire.

[WazR32GTSt]

can someone post a pic of the starter motor location?

i want to check its connection...

i recently has a walbro pump installed, and when i turn the ignition during prime sometimes i get nothing for a couple of seconds before it turno over

but once prime has finished it cranks straight away..

then again, sometimes it cranks fine!

only happened post-install of walbro by worksho[

cheers,

Warren

[Duncan]

umm....perhaps you should wait for the pump to prime before starting the car bigger pump takes longer to prime

[WazR32GTSt]

if that were the problem, then it would crank but not start

mine doesn't crank at all, like what would happen if there was an immobiliser on or something.. turn and nothing...

[tacker]

Sounds like bad connections some where.

There is no way a small motor like a fuel pump is going to bother a starter motor. If anything at all the starter motor would take the power away from the fuel pump due to the starter having a lower winding resistance than the fuel pump.

[Cubes]

With the ecu not plugged in mine still cranks...

If that at all is any help.

[AzzurrA]

and i take it you found that out the hard way, Cubes...?

[Cubes]

Yer I fried the pfc.

But got it fixed.

[WazR32GTSt]

so where in the engine bay is the starter motor and what does it look like?

any idea on its plug/wiring setup?

[Cubes]

The starter motor is on the drivers side.

Pic attached.

[WazR32GTSt]

thanks mate

i never venture down areound that area of the engine bay as there's not much there to fiddle with othe than changing the fuel/oil filter...

[MearCat]

After all the talk of upgrading the wiring to use the std wiring to power the relay and wire the battery directly to the pump... Has anyone ever considered that even if you use big 8GA wiring from the battery to the top of the fuel pump lid connector, there is still the standard wiring from the lid down to the actual fuel pump.

This standard wiring is still your weak point. I would have thought that if you are going to a rewire with thicker gauge wiring, you have to go the whole hog and replace ALL the wiring right down the the pump itself!

[mickr33]

After going to an auto electrican and having the voltage tested on my R33. The voltage

is already 13.8 direct to the fuel pump. He said it already has a relay standard?

[Bl4cK32]

i believe the voltage drops under load. Did he test it then?

[Cubes]

Yep needs to be tested underload, I was able to see mine drop at idle and rev's. So an intank lift pump to an external pump is too much draw on the std r32 wiring.

The R33's may not see the voltage drop as much as an R32 as their battery is in the boot.

I saw such a voltage drop as I run the standard intank pump and an external bosh. So 2 pumps drawing through the small wiring.

Mearcat,

wiring resistance over distance.

[tacker]

Made just over 2 volts diff to mine when i ran the direct feed.

But then again mine runs 3 pumps.

[grim32]

I just wired up a relay this afternoon and all was going fine untill i turned the car off, now the turbo timer will not keep the car running but the ignition stays on but the car just stops. If i put the wires back to standard its fine, i tried using another relay but get the same result.

Everything was wired up right

30. 12v battery fused

85. earth

86. fuel pump trigger

87. fuel pump

Any ideas on what could be going wrong?

Does anyone know where the factory pump relay is.

Thanks.

[Craved]

I just wired up a relay this afternoon and all was going fine untill i turned the car off, now the turbo timer will not keep the car running but the ignition stays on but the car just stops. If i put the wires back to standard its fine, i tried using another relay but get the same result.

Everything was wired up right

30. 12v battery fused

85. earth

86. fuel pump trigger

87. fuel pump

Any ideas on what could be going wrong?

Does anyone know where the factory pump relay is.

Thanks.

where did you get your trigger power feed for the relay from?

it will have to be from something that is retaining power once the turbo timer is activated and running.

factory pump relay for the R33 is in the boot next to battery

[grim32]

Sorry forgot to mention mine is a 32. I just cut the standard wire that runs to the pump and used that to trigger the relay.

[Cubes]

Did you use looms earth on the relay? You need to use both the looms trigger (obviously) and the looms earth.

I had issues with the fuel pump staying on when I earthed the relay to the chassis.

[grim32]

Did you use looms earth on the relay? You need to use both the looms trigger (obviously) and the looms earth.

I had issues with the fuel pump staying on when I earthed the relay to the chassis.

Ok ill try that first thing tomorrow, i just earthed the relay straight to the body.