It’s been a long time since I’ve been on here. My 1991 XJ-S convertible has sat in storage for almost 10 years with some of the engine disassembled.
My son really wants to ride in it, so I replaced the TPS (set to .34V), did the linkage setup procedure, removed all the old gas, and buttoned everything up. It started after a few tries. Idles a little rough, but revs decent. (Needs to be driven and clear out the dust.) Might be intermittent miss on A bank. Vacuum low at 12. Fuel pressure was low at 32. Let it run for about 30 minutes.
Next day I replaced the 10 year old battery. Now the fuel pump won’t come on. Inertia cut-off switch is in the non-red retracted position. Brown wire spade connectors are tight. Fuel pump relay has 12V between pin 30 and pin 87, but jumper between the 2 does not turn it on. (Incidentally, I used the fuel pump to pump out the old gas by removing the line to the rail.)
Odd that the pump would “die” after changing the battery. Feels electrical. Is there also a fuse to the brown wiring that goes from the relay to the battery? Can the ECU disable the pump even if the relay has a direct jumper? Any other thoughts?