I think your pump pushing at longer or shorter cycles could be due to a few things & they're all natural. Air in the lines, distance, amount of water in the tank and a possible block in the filter screen in one or more of the faucets. My experience has been alot of pump cycling when the water tank is full & as it empties, the pump pressure levels out to a more steady cycle. Regarding city water it should be a uniform flow providing there are no blockages in the lines. As stated earlier a reduction in water line diameter to the outside shower could cause a reduced flow, however it should not be that significant! I've had four RV's and four boats all with water pumps and mine all acted the same. Hope that helps!
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Joe & Carolyn, Venice, FL.
2011 Laredo TT 297RL
2011 GMC Sierra Denali 2500 HD 4X4, Duramax Diesel/Allison Transmission, 3.73 Gears, Reese WD with two sway bars. Dometic 3000KW Generator.
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