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Old 07-28-2021, 05:51 PM   #1
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Sureflow 4048 water pump

Has anyone experienced using this pump? I just discovered this version today when about to order a replacement for my 4008 model pump due to it's leaking back into the fresh water tank. The Pentair site didn't specify if this had improved by-pass over the much cheaper 4008 which is in most RVs.

Difference appears to be one more gallon per minute. No mention of any design changes on the by-pass. This will be used in my signature Rockwood.
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Old 07-28-2021, 06:42 PM   #2
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Have you attempted a check valve reset yet? Simple procedure and may save you cost of a new pump. Worked on my 4008 pump 3 years ago and hasn't overfilled my tank yet.
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Old 07-28-2021, 10:27 PM   #3
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Reset

Yes, Titanmike I've seen and digested the method. This new to me trailer was used as a fishing cabin on the Texas coast and probable spent most of its time on city water. I pulled the pump and opened up the head and everything looked really clean so it was reassembled and pumps fine. It didn't take long before it leaked. Spent several times going through the steps and one time it went about 5 days before the tank showed full and overflowed out the belly pan.

Thinking it may have been a ruptured tank caused me to check both grey and black tanks (massive cleaning of the black one) before proving it was only the pump. February 2021 was a bad cold spell in Texas so I was afraid of almost anything being wrong. As I'm a 74 years old recent widower, I have no help and being 6 foot one inch doesn't allow for working well in small places.

The cost of a new pump is not the problem. I don't want to make a continual habit of playing with a pump with brittle parts that aren't going to stay working. I've read that even new pumps will leak so I've raised the by-pass setting 1/4 turn and just lowered my adjustable pressure regulator (not an off the shelf unit) to about 40 pounds (the two gauges don't agree) before this test.

The original question still stands concerning the 4048 asking if it's possibly a newer head design with an improved by-pass. That is not mentioned on the Pentair website hence the question.
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Old 07-28-2021, 10:43 PM   #4
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Rebuild

I have not priced the rebuild parts to replace the drive and valve assembly on this pump as the motor itself is fine. The rubber and plastic parts in the pump I think have gotten a permanent set and will leak no matter how many "resets" are done.

You should have seen the driver side exterior wall oxidized to a dull "luster". Heat plus the Feb cold contributed to the pump not doubt.

New Goodyears all around and repack and brake parts removed on self adjusting stuff already done so now it's in good running shape. It's embarrassing to have water running out of the bottom. This is the first trailer of five to do this as the others had different pumps.
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Old 07-29-2021, 07:29 AM   #5
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Many posts about accidental filling of fresh water tank because of leaking valves....my solution....install a separate check valve upstream of the pump..have a great summer...
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Old 07-29-2021, 04:40 PM   #6
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I quit

Original question was anyone use the 4 GPM Sureflow? That's most likely overkill and the same problem with the backflow anyway. SO! Ordered Valterra RV Fresh Water Check Valve P23402LFVP from ETrailer. $11.00 and a few days wait is fine.
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Old 07-29-2021, 06:05 PM   #7
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Shurflo 4048 is showing to be a 120v pump.

I just replaced my shurflo 4008 with a dc house 42 last weekend. Nice consistent pressure at 5.0 gpm. I need to remember to leave it on trickle or I will empty my fresh tank fast.
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Old 08-04-2021, 02:58 PM   #8
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Quote:
Originally Posted by HONDAMAN174 View Post
Shurflo 4048 is showing to be a 120v pump.

I just replaced my shurflo 4008 with a dc house 42 last weekend. Nice consistent pressure at 5.0 gpm. I need to remember to leave it on trickle or I will empty my fresh tank fast.
The shurflo 4048 is not 120v, it's 12vdc. Have one in my rig and just adjusted the bypass to have more even flow. It's a nice pump and I got the faucets to flow without cycling even when partially opened.
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