[AliV50]

Hi all.
Does anyone know how many volts come out from DC/AC converter in V50 1.8F. to operate the fuel pump?

[Lelleprinter]

I tried to find AC-voltage value but I have not been able to find any information yet.
However my assumption is that it probably are 12 VAC output.

What I have found is that output voltage are a square wave pulse (alternating current) at 170 Hz
Maybe using a standard multimeter might show a different reading compared to 50 or 60 Hz sinus-wave it is designed for.

Partnumber
30765371 DC-AC converter
30794766 or 31305131 fuelpump depending on chassinumber.

Nice to have document for 1,8F motor:
https://www.volvoclub.org.uk/tech/Volvo ... xifuel.pdf

DC-AC Converter and fuelpump.png (113.95 KiB) Visad 132 gånger

[Lelleprinter]

Me again,

Spent some more time on this question and what I found out is that DC/AC converter is only for the fuel sensor's resistor,
not for the fuel pump.

Fuel pump is controlled by relay R15 mounted on CEM (Central Electronic Module) and circuit is over-current protected by fuse F74 located on CEM module.

DC/AC converter circuit's DC part is over-current protected by fuse F86, also located on CEM-module.

So from that point of view, then fuelpump is powered with DC-voltage.