What is that solenoid ?

[WABZ]

Hi folks

mine is a late '73 240z 4speed and and when i accelerate from a standstill,

i head a solenoid click at around 2500rpm coming from the passenger kick panel electrical board. What is that solenoid anyways ? There's no electrical fuel pump on this car, but 2 unplugged wires with the 2 fuel gauge wires at

the tank. am I missing a pump? it has a mecanical one, of course. Always

wondered if that solenoid is somehow related to the fuel system.

[sblake01]

Is it a solenoid or a relay? As I recall, there were two relays for the electronic fuel pump starting with 1973 Modification Plus Program and continuing through the 260Z. I'm pretty sure there would have been an electronic pump if you have the relays so someone might have removed it. Nowdays, I'm basically a 280Z guy but I've heard many 240Z owners say that their cars run just fine without the electric pump. Especially once they lose the flat tops.

[geezer]

Do you still have the original flat top carbs, or were they changed out. This is an exerpt from the "1973 Modification Plus" manual that shows the addition of the harness & relay for the control of an electric fuel pump.

I think this may explain it, or put you on track to figure it out.

[WABZ]

You guys really know your ztuff !

Never heard of that Modification plus program.

Mine had flat tops when i first got it, but quickly replaced them with

'71 carbs. Will definitively take a closer look at that panel tomorrow.

What else should i know about that program ?

I have serial no HLS30 141667

[geezer]

Since you don't have the flat tops any longer and if you find the click of the relay anoying, remove it. It's not doing anything but making noise.

[geezer]

You guys really know your ztuff !

Never heard of that Modification plus program.

Mine had flat tops when i first got it, but quickly replaced them with

'71 carbs. Will definitively take a closer look at that panel tomorrow.

What else should i know about that program ?

I have serial no HLS30 141667

Stephen knows his ztuff, I just have a four foot tall stack of books that I smack up the side of my head in the hopes something will sink in. The Modification Plus Program was the "cure" for the sometimes troublesome flat tops.

Since your flat tops are gone the only other parts other than the harnesses and relays that could have been added and still be intact would be the larger 15 3/8" diameter fan and a rubber radiator sealing strip. You say there is no electric pump. Maybe there never was one or it was removed. From what I understand, the presence of the relays and harnesses does not nessesarily mean the rest of the "Mod Plus" kit was ever installed. Measure the diameter of your rad fan, to see if it is the standard 15" or the larger one included in the kit. This is the parts list for the kit.