Help! Shurflo pump won't pump - Fiberglass RV



Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-02-2019, 11:11 AM   #1
Senior Member
 
beardrum's Avatar
 
Name: Chuck
Trailer: Scamp 16 Deluxe
Washington
Posts: 126
Help! Shurflo pump won't pump

Hi,
Once again, I turn to this forum as a problem solving resource. My 2014 Scamp 16' with a forward bath has a Shurflo transfer pump to move shower and sink water to the back of the trailer where the grey water tank is mounted. (I'll hold my grumbles about that design for a later time.)
When the sink is full, or the shower is running, the user switches on the pump to move the waste water back. We're on the road, and have been using the pump normally until yesterday, when it suddenly stopped transferring water. It runs, so I cleaned the filter, and took the pump apart and cleaned it out, finding a possible stuck check valve, but on reassembly, it still doesn't transfer water. All connections seem tight, but putting fresh pipe thread tape on ALL the connections is my next shot.

Any other ideas? I'm a little surprised to have it fail so suddenly in the middle of a trip.

As always, thanks so much!

Chuck
__________________

__________________
Chuck
2015 16' Deluxe Scamp, Layout "B"
2007 Highlander
beardrum is offline   Reply With Quote
Old 04-02-2019, 11:29 AM   #2
Senior Member
 
Raspy's Avatar
 
Name: John
Trailer: 2015 Oliver 23, Ram Cummins
Smith Valley, Nevada
Posts: 1,357
Sounds like a clog before the pump, or a stuck check valve, if there is one, after the pump.

With a water hose, try blowing out the line backward toward the shower/sink. Then try blowing out the line between the pump and the tank. You don't need special fitting for this, and it might spray some water around as you do it, but just hold the hose to the pipe and have someone turn the water on a for a few seconds. Tape up the connection or wrap it with a rag if needed. It won't take much pressure.

You already cleaned the filter and the pump, so those can't be the problem.

Is that a diaphragm, or centrifugal pump? If centrifugal, you can flush it out too, with your hose.
__________________

__________________
I only exaggerate enough to compensate for being taken with a grain of salt.
Raspy is offline   Reply With Quote
Old 04-02-2019, 01:09 PM   #3
Senior Member
 
floyd's Avatar
 
Name: Floyd
Trailer: 2004 13 ft Scamp Custom Deluxe
IllAnnoy
Posts: 7,041
Registry
The filter protects the pump, but it also can act as a dam for hair and debris.
remove the line on the upstream side of screen filter and snake the line with a bent wire or reach in with a pair of needle nose pliers to clear the line.
There is no check valve.
Also...
The bathroom sink and the shower drain work better if only one is open at a time.
The typical Shurflo pump is a sort of wobble piston design which could jam if a solid object gets in.
You could test it by putting the inlet line into a gallon jug of water then switch it on.
While the line is off, drain a sink full of water and see if it runs out of the filter.
floyd is online now   Reply With Quote
Old 04-02-2019, 03:33 PM   #4
Senior Member
 
beardrum's Avatar
 
Name: Chuck
Trailer: Scamp 16 Deluxe
Washington
Posts: 126
Thank you for your responses.

I like the idea of testing the pump by sticking the inlet line into a bucket of water. I'm pretty sure it will show the pump has no suction. It's really weird, because it was working one minute and then not the next.

The lines are clear; I get a stream of water from the sink/shower lines right at the pump, downstream of the filter. I did have to clean a ton of crud out of the filter.

I think there is a bit of a check valve integral to the pump head. When I had the pump on the table, I pulled the head off and found that a little spring-loaded diaphragm was stuck. I freed that up by rinsing it in clean water. But on reassembly and re-installation, no joy. I'm also pretty sure the lines are all airtight now, I juried up some pipe dope on all the hose clamp fittings and tightened them up.

Zeroing in on a failed pump. I'll see if I can find some fittings to try to bucket of water test.

Thanks again.

Chuck
__________________
Chuck
2015 16' Deluxe Scamp, Layout "B"
2007 Highlander
beardrum is offline   Reply With Quote
Old 04-02-2019, 04:35 PM   #5
Senior Member
 
Name: JD
Trailer: Scamp 16 Modified (BIGLY)
Florida
Posts: 1,540
Check the pump by plumbing to a pail of water to see if it will pump.
One thing people often forget is a leak on the inlet side that lets air into the pump will also shut down the pumping as it would rather pump air than water.
redbarron55 is offline   Reply With Quote
Old 04-02-2019, 06:02 PM   #6
Senior Member
 
kdhanso's Avatar
 
Name: Ken
Trailer: Scamp 19 Deluxe & 16 STD
Minnesota
Posts: 221
Registry
Quote:
Originally Posted by beardrum View Post
Thank you for your responses.



I like the idea of testing the pump by sticking the inlet line into a bucket of water. I'm pretty sure it will show the pump has no suction. It's really weird, because it was working one minute and then not the next.



The lines are clear; I get a stream of water from the sink/shower lines right at the pump, downstream of the filter. I did have to clean a ton of crud out of the filter.



I think there is a bit of a check valve integral to the pump head. When I had the pump on the table, I pulled the head off and found that a little spring-loaded diaphragm was stuck. I freed that up by rinsing it in clean water. But on reassembly and re-installation, no joy. I'm also pretty sure the lines are all airtight now, I juried up some pipe dope on all the hose clamp fittings and tightened them up.



Zeroing in on a failed pump. I'll see if I can find some fittings to try to bucket of water test.



Thanks again.



Chuck


The thing I think you describe as a check valve is the sensor used to detect pressure when this pump is used for freshwater. It turns off when enough pressure is built up in the lines. However, its not really needed for the grey water. My pump developed some scale buildup around this switch and quit working leaving the switch in the off position. I cleaned out the scale and the pump started working again.
__________________

__________________
Ken
kdhanso is offline   Reply With Quote
Reply

Tags
scamp


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Shurflo Water pump D Tharp Problem Solving | Owners Helping Owners 0 05-09-2018 01:19 PM
SHURFlo water pump reeves99 Plumbing | Systems and Fixtures 3 06-12-2016 10:18 AM
Adding shurflo water pump to sink. ?? AKSCAMP Modifications, Alterations and Updates 3 04-25-2016 01:56 PM
Plumbing in a Boler with Shurflo Pump VIDEO kevin61 Problem Solving | Owners Helping Owners 4 07-24-2008 10:38 AM

» Upcoming Events
No events scheduled in
the next 465 days.
» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 09:41 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.