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Water pump question

I have a Shurflo 2088-403-144 pump. I want to disconnect the inlet line so I can attach a hose to pump antifreeze through the system. I can't find which is the inlet and which is the outlet anywhere. As it is mounted in my coach the LEFT side has the two red wires. The other side as no wires. Which is which?

Re: Water pump question

Reply #1 –
Input side of water pump is fed from hose at bottom of fresh water tank.

Re: Water pump question

Reply #2 –
Thanks, Barry. Yes, I understand that. The problem is that I'd have to do a lot of disassembly work to figure that out, since there is a wall between the fresh water tank and the pump. I suppose I could close everything up, take the coach over to a water supply, put some water in the tank, then remove one connection on the pump. If water comes out that's the input side. If no water comes out it is the output side.

I think once I find out which is which I'm going to label if for the next time someone needs to know. Would have been nice if ShurFlo had done that on the pump.

Re: Water pump question

Reply #3 –
There should be an arrow on the pump head
previous 1984 35 ft ORED 250 HP 3208 Cat       
previous 1998 40 ft U295 CAI 325 hp Cummins
previous 2003 40 Ft u320 build #6140 450 Cummins M11.                                                         
1999 Mazda Miata
Ron, Nancy, Tipper the cat, Max The dog
1997 U 270 36 ft build number 5174 8.3 Cummins

Re: Water pump question

Reply #4 –
My water pump is a shrflo 4008.  Inlet side is where the filter screen is on photo.

May not help though with your model number differences.
Dan - Full timing since 2009
2003 U320 40' Tag 2 slide

Re: Water pump question

Reply #6 –
Thanks, Dan. Just what I needed.

Re: Water pump question

Reply #7 –
Dans picture shows the arrow also.
Richard & Betty Bark & Keiko our Golden Doodle
2003 U320T 3820 PBDS
Build # 6215
MC # 16926
2016 Chevrolet Colorado 4X4 diesel

Re: Water pump question

Reply #8 –
David, Shurflo pump DOES have an arrow on the top of the plastic part between the in & out ½" hoses.

Also, modify your hoses with a Tee & valves and a new long hose that reaches the ground. Put hose in antifreeze bottle, close off fresh water tank, open antifreeze bottle hose, turn on pump.. If you have hot water tank, find a way to bypass it or you will put 10 gallons in tank (after you drain tank).