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Old 10-29-2020, 06:08 PM   #1
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Terrible Water Pressure in Shower

My shower water pressure is terrible when using the pump. It is so bad that the diverter valve on the tub spout can't even stay fully open so water comes out of both the tub spout and shower handle at the same time. If I hold the diverter valve in, the water is still pretty weak at the shower head. My sinks seem to have good pressure although it is hard to tell since they all have aerators. Is this normal because it is designed to have low water usage when dry camping? When hooked up to city water, the shower is fine.

(2000 Newmar Mountain Aire 4080DP)
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Old 10-29-2020, 07:44 PM   #2
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Sounds like the pump impeller may be worn and pumping insufficient water to maintain pressure with full shower flow. You should try running water into a bucket from the main bath valve and time it. The pump should have a GPM rating on the manufacturers label or in your RV manual . This at least will tell if the pump is pumping the rated GPM. Double check the valves to your outside shower if you have one are closed.
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Old 10-29-2020, 07:57 PM   #3
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Can your shower head be limed up? If it is soak it in CLR or “something like it “to clean out the crud.
Can’t think of the actual name.
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Old 10-29-2020, 08:03 PM   #4
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It is likely a diaphragm pump - no impeller.

On the suction side of the pump is a strainer, normally with a clear cover and screen. Many manufacturers leave all kinds of plastic shavings and debris in the FW tank and plumbing system. Open the strainer, remove the screen and clean it out to see if that helps.
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Old 10-29-2020, 08:09 PM   #5
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Mine was also low flow/ pressure on the water pump, I upgraded to an Oxygenics Hand Held sprayer .
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Old 10-29-2020, 09:54 PM   #6
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Thanks all for your help. I did not know there was a little strainer on the inlet side, will have to check that. Also good idea to see it the shower head is limed up. It does look a little old so that could definitely be the problem as well. Going to do all these checks this weekend and report back. Thanks!
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Old 10-29-2020, 10:35 PM   #7
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If the shower head is limed up you can dissolve the calcium with white vinegar. It works as well as CLR and it's much cheaper.
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Old 10-30-2020, 12:02 AM   #8
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If your shower valve has a cartridge it could be plugged
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Old 10-30-2020, 08:00 AM   #9
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Quote:
Originally Posted by SoCalD View Post
My shower water pressure is terrible when using the pump. It is so bad that the diverter valve on the tub spout can't even stay fully open so water comes out of both the tub spout and shower handle at the same time. If I hold the diverter valve in, the water is still pretty weak at the shower head. My sinks seem to have good pressure although it is hard to tell since they all have aerators. Is this normal because it is designed to have low water usage when dry camping? When hooked up to city water, the shower is fine.

(2000 Newmar Mountain Aire 4080DP)
You mentioned the pressure is fine on city water. I would say you're pump inlet screen is plugged. When I bought my coach I changed out all the screens in all the faucets, shower wand and even the black tank rinse. All the screens were almost plugged.
The typical pump is 2.7 gal/min at 50psi. I upgraded ours to a 4gpm an 60psi - what a difference.
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