ShurFlo 5.7

[timvasqz]

One problem with a two pump system is both pump heads must work for
any one to make pressure. if one pump fails and it is not an
electrical failure, the valve in the pump fail open and let water
cycle thru that path backwards to the tank. using a backup pump in
this situation is the same as running a pump with the fill switch
open. It would be necessary to block the failed pump path at either
end to keep the water from the good pump from making its way back at
the tank.

I can run both pumps installed by BB at the same time which will help
maintain psi at the nozzle or help run two faucets at the same time.
I dont like to use both because when a pump comes on to repressurize
a closed system it is always better for the motor and e -load if
the pump comes on when the system is open and at 0 or low pressure.
this allows the motor to turn free and come to speed quick.

Greg ofTim&Greg
94ptCa

--- In WanderlodgeForum@yahoogroups.com, Ryan Wright
wrote:
>
> Update on my water pump problem:
>
> As it turns out, voltage drop was indeed the problem. This project
> took me awhile to solve because I made it bigger than it had to be -
> as usual. I took the bedroom apart and ran a new, 40 amp fused +12v
#8
> gauge wire direct from the batteries. I terminated it in a custom
> enclosure under the driver's side bed with (4) fused links that
light
> LEDs to indicate a blown fuse. I now have 4 separate, fused circuits
> under there with plenty of available power. One of them powers the
> pump with a #12 gauge wire and a 20 amp fuse. I installed a water
leak
> detection system under both beds and put that on another of the
> circuits, leaving 2 more available for future use.
>
> Inside the aircraft bin storage up above, I pulled the backing panel
> off and found a large copper ground bar. I tied a new ground there
> with another #8 gauge wire and terminated that with a small screw-
down
> bus bar under the bed near the new fused enclosure. I installed a
> relay on the existing pump circuit to flip power to the pump.
>
> While I was under there, I also replaced most of the flexible water
> lines, including the main line feeding the water tank. I installed a
> valve on the main line to make future plumbing work possible without
> draining the tank, and I removed the old strainer and installed the
> new Shurflo Extreme strainer I bought with the pump last year. Oh, I
> also put labels on the new circuits indicating their purpose &
> termination points so as to make it easy to service for any future
> owner, just in case I sell the coach some day.
>
> The system works GREAT now! In fact, the pump is running much slower
> and quieter while providing more pressure. I'm very happy. My next
> trick, to finish this up the way I want it, will be to purchase a
> second pump and tie it into the main system - I already made room
for
> one next to the existing pump. I'll install a switch to flip a
relay &
> select between the two pumps, so if I'm on the road and I lose a
pump,
> I'll have a live backup at my beck and call without needing to tear
> the bed apart.
>
> As always, I thank the members of this forum for their valuable
> advice. Without you folks, I probably wouldn't have bought this
great
> coach in the first place and if I did, I definitely would have a
hard
> time maintaining it properly. I lurked here for a couple of years
and
> this forum was a huge factor in my decision to buy a Wanderlodge vs.
> some other brand.
>
> -Ryan
> '86 PT-40 8V92 (Now with great water pressure again!)
>