Yeah normal ish sort of thing on the gauge at Matt's is the only way to interpret the actuality of it, it was one I got by accident that did 500psi! I got it for 100psi post-rehaul oil-pressure but can't imagine 500psi anything being trusted near it. But the needle did move significantly, like mine did.. A bit of petrol spurted when the pipe blew off, there's power behind it..! :-|
There's probably a difference between cars sat on driveways and ones that get a run to pump anything through with full opening load levels...
You remember that trouble I had with hunting and idle and stuff, seemed to cure itself around the time of testing the fuel pressure.... When it ran out of petrol it ran like a dog, until I did it again I stated to think, but I also think "crunchy wiring" often..
Then Matt's went from black-sooty-fume-ridden exhaust to clean-water about the time of a pressure test... So I "tested" mine. It's not like a 5sigma result, but next time it runs out I'll bear it in mind..
And when mine ran out on the drive again, I put a canfull in, it started and I left it while we've been spraying..
If you've got lumpy idle still give it a go mate! :-)
NEAL