ShurFlo 5.7

[Ryan Wright]

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!)