Water Pump Trouble

[Treadwheeler]

I am paying the cost for not winterizing...
So far have had to replace valve assembly in bathroom faucet & shower head, completely replace kitchen faucet (valve components and outside collar cracked) and repair one water line in basement behind water control panel. City Water functionality appears to be OK now.
Turn water pump on and it runs nonstop and all faucets have 90% air 10% water mix when opened. Took output line off water pump and capped it – pump still runs nonstop. Also uncapped it and turned pump on and I get same thing directly out of pump as when I turn any inside faucet on. So I think I have eliminated there is an issue with lines on output side of pump.
First question is if there is a problem (broken line) between water tank and pump so air is entering system could that cause pump to run nonstop because it can’t build up enough pressure to stop pump? Or, could pump itself be the problem. Impeller? I figure my next trouble shooting is to remove pump from trailer and run input side to direct water source and see if it pumps water. If pump seems to function properly in that test I guess that indicates problem with line(s) between tank and pump. Any suggestions to trouble shooting that as access to all those lines is limited…

Did not take any pictures last weekend, though I will be working on it again this weekend so I can show basement line and repairs thus far if it helps...

Trailer is 2014 Voltage 3895
Thanks in advance…

[naturist]

Ouch! Paying the price = Fool's Tax™

Sorry for your pain. You really have no choice but to examine the lines through the pump all the way to the tank. And don't stop that journey just because you find a cracked fitting, they could all be bad.

Now, Go Forth My Son and Sin No More. (as in remember to winterize next fall, unless of course, you found this one so much fun you simply must repeat)

[Old-Biscuit]

They are a diaphragm type pump.
Loose fittings on suction side of pump will suck air
Cracked fittings on suction side of pump will suck air
Cracked housing on pump will suck air
Open line on suction side of pump will suck air

You are sucking air somewhere on suction side of pump.
1st check pump housing and suction strainer for cracks.....water left in pump :E

[nevadanick]

Tighten the fittings on the intake side or possibly cracked on intake side. Its sucking air.

[enblethen]

Check your water fill for an anti-freeze suction line.
Verify fresh water tank fill is completely closed.
Water in tank?