Need help choosing new pump.

[Doug C]

1992 25’ Excella:

I’m looking for a new water pump to replace the original Shurflo 2088-403-144. The old one is rated at 4 amps and 2.8 gpm. I found two new Shurflo Revolution 12v pumps online as listed below:

Name : SHURFLO® REVOLUTION™ Pump
Model Numbers OEM/Aftermarket : 4008-101-A65, 4008-101-E65
Voltage : 12 VDC
Flow Rate GPM/LPM : 3.0 GPM [11.4 LPM]
Amps (Max.) : 7.5
Shut-Off Pressure : 55 PSI [3.1 BAR]



Name : SHURFLO® REVOLUTION™ Pump
Model Numbers OEM/Aftermarket : 4028-101-A54, 4028-101-E54 Voltage: 12 VDC
Flow Rate GPM/LPM : 2.3 GPM [8.7 LPM]
Amps (Max.) : 5
Shut-Off Pressure : 50 PSI [3.4 BAR]


If I go with the top one, I get about the same gpm but it draws almost twice the amps.

If I go with the second one listed, I lose .5 gpm, and it still draws 25% more amps than the original.

What’s going on? Does anyone have any suggestions or explanations to help me understand? How many amps can I pull to run the water pump without causing short- or long-term problems? How many psi will the water lines in these trailers normally accept? Any specific pumps I should be looking at?

Thanks very much,
Doug

[rideair]

You have to ask the question, how much water do you need at one time and how fast do you want to empty your water tank? Take a look at you showerhead, what's the GPM for that? 1.2-1.5 GPM?

So unless your wife is doing the dishes or brushing her teeth while running the water, more is not always better. Though I'm sure some will disagree.

Your fuse is most likely at 20amp, higher the amp on the water pump, the faster you kill the battery. PSI is normally tested up to 65psi or more though most will find 35-40psi the normally operating level when using the trailer, I'd go with the smaller one.

Enjoy,

[SeeMore]

The closest match to the original is the SHURFLO® Classic 2088-422-144/444 which is hard to find affordably. Those who have it want over $125, up to $170, not including tax, shipping, handling, etc.

SHURFLO® Classic™ Pump
Model Numbers OEM/Aftermarket : 2088-422-144, 2088-422-444
Voltage : 12 VDC
Dimensions Inches/Millimeters : 7.84" x 5.0" x 4.62" [199 x 127 x 117mm]
Flow Rate GPM/LPM : 2.8 GPM [10.6 LPM]
Amps (Max.) : 7
Shut-Off Pressure : 45 PSI [3.1 BAR]

However, you can find the 4008 Revolution on Amazon for ~$80 shipped to your house.

I doubt you'll hurt your baby if you go with the higher pressure unit, i.e., going from 45psi to 55psi as current units have a regulator for the city water fill that is calibrated for 65 psi. The most noticeable difference will be when you take a shower. The new unit will a lot more quite than the older model.

[DKB_SATX]

I recently installed a Flojet 03526, which is rated for 2.9 gpm I think, and something like 5.3 amps. I have no complaints, but I was replacing a thumpy old PAR so that may color my impression of the new one. I paid $56.30 on Amazon.

[rideair]

Unlike many, I love the sound of the old PAR pumps, still use one to this day. Plan to rebuild and use one in the 1956 Safari FK that Shacksman is working on. I think they are so cool. CLACK, Clack, clack............

Enjoy,

[64Lincoln]

Originally Posted by rideair

Unlike many, I love the sound of the old PAR pumps, still use one to this day. Plan to rebuild and use one in the 1956 Safari FK that Shacksman is working on. I think they are so cool. CLACK, Clack, clack............

Enjoy,

Is the Par pump the big one with the separate motor and belt that was used in the 1960's Airstreams? If so, there's a nice one on Ebay.

[idroba]

Overall, pumps run for so little time that the amp draw difference is not very important. It is time that things run which is important for battery conservation. Pumps are very small ENERGY users overall. Energy is what batteries store.

[Doug C]

Are a lot of guys running 55 psi/7.5 amp pumps (Revolution) pumps with no problems? The old pump doesn't show a PSI rating so I don't know what the trailer water lines have been taking the last 22 years.

Thanks,
Doug

[idroba]

Many of the old water pumps ran at 20 to 25 PSI while newer technology has allowed the pump pressures to be higher and still not use much power.

Since "city" water pressure is virtually always higher than 45 to 50 PSI and the built in water pressure regulator in the Airstreams is set at about 60 PSI there should be no problems with any newer pump you can find on the market.

If your '92 was plumbed with the gray polybutyl pipe, the main thing you need to watch for is breakage at the fittings. The chlorine used in city water systems tends to cause long term damage and broken or cracked fittings happen. Re plumbing with PEX and PEX type fittings is something that anyone who has gray poly pipe should consider, prior to failure and the water damage which could occur.