Joe, the red low-fuel light is a separate wiring both in the sender and the feed wire under the left engine cover. Make sure the wire is still connected to the sender; if so, the problem may be in the sender itself- which is removable without disturbing the tank. You remove the left rear quarter window and the sender comes out without brutality.
slojoe; A few ideas:
1.) Make sure the connection tabs have the proper orientation. My connection tabs are pointing to the outside or towards the quarter window. The float assembly has a long reach into the tank and if someone previously pulled the assembly without proper re-installation, the float is against the side of the tank, holding it down.
2.) Check the wiring. Mine has the white/black forward, yellow rearward. The black, ground wire is under one of the small bolts. Scrape for proper grounding. Black ground runs all the way from sending unit to the common ground post on driver's side under dash.
3.) Since you were working with a new fuse panel, make sure your yellow/black illumination wire is not feeding the light of the fuel gauge.
4.) Lastly, if all else fails, as previously mentioned, pull the sending and and inspect for a float full of fuel holding it down or a broken wire.
My problem is a little different, my fuel gauge always reads Full? Where do I start? could a ground be the Problem? While driving one time hit a Bump and Noticed the Gauge moved, but went back to Full! Already ran out of Gas not paying attention! Thankfully it was in My drive way. lol
quote:
Originally posted by Cuvee:
My problem is a little different, my fuel gauge always reads Full? Where do I start? could a ground be the Problem? While driving one time hit a Bump and Noticed the Gauge moved, but went back to Full! Already ran out of Gas not paying attention! Thankfully it was in My drive way. lol


In my case the float got hung up on the side of the tank. Nice to have a boroscope to find the problem.
If it is the sender,the Pantera tank is so tall, the actuating arm is extremely long so a FIAT, Alfa Romeo etc sender is similar but all have short arms. There are no cheap work-arounds. But all the vendors stock the reproduction late sender which fits both early & late tanks, reasonably. In early tanks, that gives you an extra fuel-out port. Many owners that convert to EFI use the early welded in-tank fuel port for the fuel return and the easily serviced fuel port built into the late sender for a fuel feed.
I had the same problem...Found a new sender unit from a Fiat X 1/9....But it was a bit longer , so had to make it shorter.Finally Got it installed without removing any Windows..was afraid When connecting the battery power...AS i didnt want the sender to glow inside the fuel tank! But all worked perfectlyWink

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Guys, my comment about removing the rear window for safety is because the OEM sender arm is hardened steel wire and usually cracks at the bend going into the rheostat box, if bent during removal. A broken sensor arm is practically unrepairable, while the entire window & frame is only pressed into the body so removal is trivial. Good luck....

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