you might want to check how long it takes for the pressure to run down though.

I had a pump that was not holding pressure a while ago. I found the results of testing with a fuel pressure tester interesting.

The 'broken' pump that wasn't holding pressure would lose all the pressure right away. Turning the key to posII and letting the 'prime' happen a few times, I could build the pressure up to about 35 psi which should be fine to start. But as soon as it got there, and the pump shut off at the end of the prime cycle, the pressure would start too fall off right away. Basically all the way down to 0 psi.

When I got the new (to me) pump in, it would build right to almost 40 psi on the first prime cycle. And when the pump shut off the pressure would basically stay the same. It would take about a half hour for the pressure to slowly leak down to 'very little' which I think was down around 10 psi.

So a fuel pressure gauge might give you some more information about what's going on in there.

As KlausC says, the real issue is whether there is still fuel in the line from the pump to the injectors - the pump can do it's thing in a couple seconds if it doesn't have to refill the line.

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1998 V70 AWD->FWD Turbo 200k+