I have a 87 244 b230f that I've basically redone all of the wiring for but im stuck on some fuel pump related wires.

I have what I believe is the out of tank pump yellow/red wires from fuse 4 to under the back seat(1st picture)

In the trunk I have a 2 wire connector(gray and black) with a ground and then also a single blue wire and a single black wire.(2nd picture) I thought these were supposed to be for the fuel pump but everything I find says it should be yellow/red wires so now I'm not sure at all. Any help would be super appreciated, than you.


Under back seat

In the trunk

 

the main fuel pump is driven by a yellwo red wire that connects to a yellow wire that goes to the main pump, black wire to ground
the tank pump is driven by yellow red to yellow red to lback, and a brown ground wire.

the tank pump assembly also includes the fuel level sender, which is a grey wire, and shares the same brown ground wire as the in-tank fuel pump

the wiring should look ssomething like this...



which I cribbed from here,
In the Tank - 240 Volvo Tank Pump and Sender

 

I'm pretty sure that picture is from a wagon, mine is a sedan. so the yellow/red wire under my bag seat is for the main pump. And thank you that does explain the the grey and brown.

but I'm still confused as to what the blue(and black but I'm sure it's a ground) single pole/wire connector is for. Any ideas?

 

well, the only other stuff in that general area i can think of is the power antenna... black control wire to tell the antenna up/down (hot to go up, off to go down), and green power wire. it grounds through the body (and yes, note that black wire here is NOT ground).

lets see, what else is back there... rear window defroster is a yellow wire on the left side, but that goes up from the left rear wheel hump, so likely would not be under the seat.

the speedometer sensor comes out of the rear differential, and uses a blue and a black wire, but afaik, those wires are /under/ the car, but I'm not sure where they enter the passenger compartment, the wiring diagram sort of hints they head to the left bottom just in front of the left rear wheel, forward to under the left A pillar and up to the dash. the wiring diagram shows these as having inline single-wire inline connectors, too.

 

the ‘87 244 speed sensor wiring comes through to the inside alongside the tank pump wiring. that’s likely what you are looking at.