My first thought too. But I can't imagine getting a mechanical pressure (normal engine running without boost) reading if the sender feed is before it.
Can you describe where the press sensor is mounted & where the line is T'd into the main fuel line?
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
Last edited by Ralph Inkster : 10-30-2020 at 10:43 AM.