1980 450 SL Fuel issues

[JOWENS79]

hello,
I'm new here.. i have a '80 450 SL R107 that has a crnks, runs 5 seconds then stalls issue.. it has had the fuel PKG, injectors, injector sleeves and fuel tank screen replaced... after the injector replacement it started and ran for about 10-15 seconds then stalled again. it will run on fuel cleaner or brake cleaner smoothly.. the fuel pump only has power when cranking not with key on engine off. i was told to check the fuel pump relay and a fuse but getting mixed info on where they are located. does anyone know where i might find these 2 relays and fuse? also not sure if it matters or not but the fuel level sender stopped working just before it started doing this.