using stewart 240 fuel pump questions

Possibly a silly question but I'm using 2 stewart warner 240 fuel pumps in parallel feeding a 302 ford. When I turn on the pumps they work great then the fispa fuel filter/regulator fills up the le mans carb gets 5psi pressure, then the pumps start to slow down, even stop and start up again when I start to empty the regulator. Do these pumps slow down when they reach the needed pressure, if they do I had no idea that these work that well. I have a relief valve after my pressure gauge so that if the pressure goes above 5psi they open up and return to the fuel tanks. Any people with 240 experience thanks in advance

Randy V

Lifetime Supporter
Yes, they do stop when pressure limit is reached... That’s one of the things I like about them.