Just went thru the volts/pump/gauge issues with the 55.
The entire system is totally new. All ground points are welded 1/4" studs on the body, with 1/0 cable connections from the batt, [+ & -], to the frame, direct to the ,engine and body.
Volt meter readings, [dash Autometer], were about 1 vdc lower than the alt output.
Fuel gauge was about 1/4 tank off.
I checked the ground ohms at the tank, got 22. [This is a grnd with #12 wire to the stud, [star washers, etc], then directly to the batt.] The tank ground is a 1/4" stainless stud welded to the tank.
WTF is this about??? I removed the wire from the stud, and ran directly to the batt -. Got .2 ohms.
The gauge came much closer to a correct reading. [I drained the tank, and weighed the fuel]. I noticed that the reading with KOEO, the reading was as mentioned. Eng running , even closer.
Moved to the gauge panel, and checked ohms across the grounds...Again way too high at 26. Cleaned, retightened, >>> .2 ohms.
Since the fuel ga is nothing more than a volt meter w/ a different face, the volts made the difference.
The volt meter also picked up that "lost" volt....
Morale of the story... Check the gounds EVERYWHERE. Also, check the pos/neg sides for volt drop. The cars are getting old, and the wiring integrity is ?? My issues show that even new systems can be a PITA....
I had to reset the fuel pressure reg, after the issues were resolved..
[ In tank Supra pump]
For those so inclined to really do a wire job......Check this stuff out.
http://www.racewiresolutions.com/
