Technical 1977 124 Electronic fuel pump won't turn off

[Greexican]

I have a 1977 124 on which a PO installed an aftermarket electronic fuel pump. I can confirm the car is a 77, but some of the wiring appears to be more that of a '76, such as relays being in the engine compartment and having the green/black wire from the electronic fuel pump running from the trunk to the ignition switch. I have no idea how many people have owned this before I bought it this summer. My issue is that if I turn the key to the OFF position to be able to remove the key, the fuel pump stays on. The only way to have the pump not running is by turning the key approximately 45 degrees to the right from the OFF position. The problem is this locks the key in the ignition so I have to leave the key in it at all times, which is obviously a security issue in parking lots!

I replaced the ignition switch already to rule that out as a potential issue. AutoRicambi sent some good instructions with the switch, but I have more wires than they speak of on the instructions and wonder if anyone on this group has some advice. Here is how I have the wires connected to the terminals on the back of the ignition swicht (which is how it was when I bought it):

15 - Pink (appears original) & Red (new and confirmed to go to new ignition coil)
30/1 - Black (appears original)
INT Spade 1 - Green/Black (runs to electronic fuel pump) & gray (unable to trace)
INT Spade 2 - Blue & Blue/red (not able to fully trace, but lights to not work when disconnected)
30 - Brown (appears orignal)
50 - Red (thick and appears original

Instructions from Auto Ricambi state tech '76 has the green/black wire for the pump which needs to go to a relay attached to the pink wire, but I don't know if that means I use the little "spade spliter" which came with it to attach the green/black wire to the same terminal on the switch. Plus that green/black wire is on the same plug as the gray wire mentioned above. I don't want to fry the new switch or have ruin something down the line by just trying this.

Anyone have any insight or thoughts here? I just need to be able to shut the car off and remove the key with out the fuel pump still running...obvously!

THANKS!!

 

[Slotman]

Hi! I'm guessing you haven't gotten replys because it's kind of a tough question to answer not knowing what previous owners have done..was the car in this condition when you bought it, with the pump not turning off? I'm curious if from the factory the car had a mechanical, or an electric fuel pump? And if the current electric pump is original to the car, or an aftermarket pump added later? If it's an aftermarket pump it's anybody guess about what wire goes where, and it does sound a bit like it was wired incorrectly...if you can determine its not a stock factory pump, and consider its not wired correctly due to the fact it doesn't turn off, the fix might be as simple as finding a new place to connect the "hot" wire for the pump to a connection that only comes on when the key is all the way on....if you determine its a factory electric pump then it's a different story, but still someone before you hooked it up wrong and the hot wire needs a different source that's only on when the key is all the way on...
Sorry, I went back and reread your post, and you mentioned it's an aftermarket pump, so the fix seems simple? Identify the "hot pump wire" that makes it turn on, get a meter and identify a terminal to hook it to that only has power when the key is all the way on, and you should be good...again was the car like this when you got it? Also if someone wired it like that, it wouldn't hurt to check everything they did, the other wires, and the line connections

 

[Greexican]

Hi! I'm guessing you haven't gotten replys because it's kind of a tough question to answer not knowing what previous owners have done..was the car in this condition when you bought it, with the pump not turning off? I'm curious if from the factory the car had a mechanical, or an electric fuel pump? And if the current electric pump is original to the car, or an aftermarket pump added later? If it's an aftermarket pump it's anybody guess about what wire goes where, and it does sound a bit like it was wired incorrectly...if you can determine its not a stock factory pump, and consider its not wired correctly due to the fact it doesn't turn off, the fix might be as simple as finding a new place to connect the "hot" wire for the pump to a connection that only comes on when the key is all the way on....if you determine its a factory electric pump then it's a different story, but still someone before you hooked it up wrong and the hot wire needs a different source that's only on when the key is all the way on...
Sorry, I went back and reread your post, and you mentioned it's an aftermarket pump, so the fix seems simple? Identify the "hot pump wire" that makes it turn on, get a meter and identify a terminal to hook it to that only has power when the key is all the way on, and you should be good...again was the car like this when you got it? Also if someone wired it like that, it wouldn't hurt to check everything they did, the other wires, and the line connections

Thanks for the response...yeah it's a bugger of a situation! This is how it was when I bought the car and I think this will end up being a "nice" winter project when I won't be driving the car anyhow!

 

[Slotman]

Just try finding the hot wire to the pump, and connect it to a different place that's only hot when the key is all the way on, that should fix it temporarily anyway