Originally Posted by CaptTom
................. When they list the maximum head, is that just to get it primed, or after?
I can accept the fact that they won't run continuously for hours. How long can I use one before letting it cool down?
Maximum head for a pump should
include BOTH intake and outlet pressure drop. One has to read the literature carefully. Head is defined, in engineering, as the TOTAL pressure the pump has to work against.
Different types of pumps can prime better than others. If in doubt, have the pump located below the intake tank. Learn about different types of pumps. The West Marine
Advisors have a good discussion.
The small Facet fuel pump
I have on my boat
has been working, continuously, for the 15 years since I put it in, and the one before that for fifteen years. It's on whenever my engine
runs, and I just completed a six week trip from SF to Vancouver Island, running sometimes 14 hours a day. Over 20 days underway.
You HAVE to find a continuous rated pump. Period.
Originally Posted by Lojanica
- Self-priming to about three feet and can pump against a discharge head up to twenty feet
This is a very good description as an example.