ShurFlo 5.7

[Bob Lawrence]

Hi Ryan,
I had the same problem.
Voltage drop was the problem.
I solved the problem by running a hot wire direct from the pump to
the batteries, with a fuse in the line.
Problem solved.
Bob Lawrence
84 PT36
Fulltiming, presently in San Antonio, Texas
> Hi folks,
>
> I've got a problem with my relatively new ShurFlo 5.7 water pump.
> ShurFlo doesn't know what to tell me, other than to send it back to
> them, but before I do I'd like to see if anyone here has experienced
> similar behavior.
>
> The pump runs for about 30 seconds, then cuts out for a couple of
> seconds as if it's reached it's target pressure despite my faucet
> being wide open. Then it runs for 5-10 seconds, cuts out, and
repeats
> this behavior indefinitely. If I open more faucets, I can hear the
> pump boost it's operating speed and it runs slightly longer between
> cutting out. After a few minutes of this on & off behavior, the
stops
> become more abrupt and I can hear a relay inside the pump flicking
off
> during each cut.
>
> Anyway, I'm assuming the pump is faulty and will be returning it to
> ShurFlo, but I did want to ask here first. I thought these pumps
were
> supposed to adjust their speed in real time to deliver just the
amount
> of water needed, not shut down entirely? My intention is to buy a
new
> one right now and keep this one as a spare after ShurFlo replaces
it,
> but I'm also concerned of the remote possibility I bought too much
> pump for my coach's plumbing system and a new one won't behave any
> better. What do you think?
>
> -Ryan
> '86 PT-40 8V92
>