ShurFlo 5.7

[freewill2008]

Ryan - We've been through two 4.0 pumps and a 5.7, similar problems.
Shurflo sent us new pumps but it turned out we had two problems with
the pumps.

First, the 4.0 Shurflo pumps ran as you described.

Second, The 5.7 had problems AND it drew more power than our bus was
designed for. The BB pump breaker was 8 amps while the 5.7 needs 10
amps. I had to install a bigger breaker and go up one wire size.

Before returning the pump, do this: Put a volt meter on the power
lead from the bus at the pump. Run the pump and note the voltage.
If the voltage goes up as the pump stops, return the pump. If the
voltage goes down as the pump stops, look for a problem between the
battery and the pump (breaker, wiring, any pump control devices
installed by BB).

After three Smart Sensor pumps we had Shurflo send us the non-
electronic version of the 5.7 (it is sold as a marine wash-down pump)
and used their big stainless accumulator tank. Works great. The
pump starts when the accumulator is down rather than every time you
open a fawcett.

Bob Griesel '84 FC31 WLII WA



--- In WanderlodgeForum@yahoogroups.com, "Ryan Wright"
wrote:
>
> 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
>