M35 Aftermarket Fuel Pump

[Dose Pipe Sutututu]

Should be more than fine, especially the overall fuel pressure would never exceed 3.5bar (assuming that thing never gets more than 0.5bar of boost in stock form).

According to the chart, it's 11amps.

[GTSBoy]

2 hours ago, iain_ST44GA said:

I definitely know the first rule here, look first, ask second. I've seen many people get roasted 😂

I found a few diagrams for the RB, but I'm yet to come across one for the VQ. From what I have read, the pump gets the +12v along with the FPCM, and it's the negative wire that gets passed through the resistor to regulate the voltage. So I assume I can just ground the negative wire at the pump to eliminate the FPCM control. But I really wanted to see the VQ circuit diagram first to make sure I understood it correctly. Once the new pump is in I'll do some testing to see how it behaves, and in the meantime, I'll keep looking for a wiring diagram.

Thanks for your help mate, your time is greatly appreciated.

My apologies. I forgot we were talking about weird beard M series stuff. Had been talking elsewhere with someone about an R33 with similar subject and got confused.

[iain_ST44GA]

17 hours ago, GTSBoy said:

My apologies. I forgot we were talking about weird beard M series stuff. Had been talking elsewhere with someone about an R33 with similar subject and got confused.

All good mate, the info helped me a lot 

Once I got the pump out of the tank, it was clear why it shit itself. The pump assembly and tank were full of mud and rust. Yukk! 🤮

It took f&%king hours to clean everything up properly!

[iain_ST44GA]

For those who might be interested, the below is the wiring to the pump hat on the M35.

[GTSBoy]

Yeah - that's pretty gross.

[Dose Pipe Sutututu]

did someone fill up the tank with rain water? lol

[iain_ST44GA]

1 hour ago, Dose Pipe Sutututu said:

did someone fill up the tank with rain water? lol

also possibly backed up to my filler and shat down it! 🤣

[Dose Pipe Sutututu]

Here's the chart for fuel pressure vs. current draw, assuming your base fuel pressure is 3 bar and you run like 0.5bar boost on WOT, you should only momentarily hit 9amps here and there.

(Ignore my prev post, I cannot read a chart these days it seems)

[MBS206]

3 hours ago, Dose Pipe Sutututu said:

Here's the chart for fuel pressure vs. current draw, assuming your base fuel pressure is 3 bar and you run like 0.5bar boost on WOT, you should only momentarily hit 9amps here and there.

(Ignore my prev post, I cannot read a chart these days it seems)

Pressure when IDLING, is meant to be 51PSi... So that amperage value needs to go up a fair chunk... I'd personally be factoring for more like 12amp at least on those runs, and at that point you need to hope the already there wiring doesn't drop you a volt or two, as that's a lot of fuel pressure flow drop off from 13.5 to 12V!

Taking idle pressure of 51psi, means the pump will be drawing a MINIMUM of 9amps all the time based on your reading of the graph (3bar base, then allowing an extra 0.5bar for boost = roughly 51psi)

Edited 3 hours ago by MBS206