I filled mine with straight water and pressure tested it.... fixed a few small leaks....
Cycled the fuel pump with the front line in a can, got the air out any trash in my lines post filter.... then hooked up to the rails and cycled pump again and looked for leaks...
You wont hurt anything by doing it the other way, but other than hearing it run for 20 seconds I don't see the point....I'd rather have it be able to run for a longer time so I can go over the entire thing....let the cooling system build pressure etc.... there are plenty of things that you may not know about until its been running for at least a few minutes and even more once its at full temp...
I get not having EVERYTHING installed...... but by doing it this way all you really know is that you can get it to run....which is good.... but lots of other info will still be unknown until it runs for a longer time
To each his own.... nothing wrong with either way.....
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