The Facet 41050 pump I put on has 3/8 npt fittings and it ws easy to find compression fittings that enabled me to put it in line. Getting the tubing fit between the tank fitting and the pump took the most time. I mounted the pjump to a piece of plywood with a strip of foam epoxied to the bottom. Took doghead's tack and used torpedo/banana plugs to connect to the existing line at the plug. Sounds great, no? All was fine until I found that there was no current to the plug. Clipped the pump to the batteries and ran it for ~5 minutes, watchng the bleed screw above the filters...nothing,, and the pump didn't prime. Only thing I can think of is that the pump cannot lift the 15 or so inches from the tank, so I'll try pumping from a container thats higher. If that doesn't work I'll probably pull the in-tank pump out and see if it will run off of the batteries. Glad I have the NOCO chargers.
Update 1: Tried to run the in-tank pump off of the batteries...positive to the pin on the left, negative to the right....silence. Didn't try swapping the pins. I will change the filters next, and see how they look. Tried pumping from a container of diesel that was higher than the fuel tank; the little pump would not prime, so I'll call Facet tomorrow; might try swapping the pins on the in-tank, then taking it out. Pressing on.
Update 2: Pulled the in-tank pump before starting on the filters. Looks pristine, but does not frun when connected to 24v...assumed the larger pin is +, but chjoice of pins made no difference. Filters today.
Update 3: Flipped the console switch; listened to the alarm; measured 0.7 V at the plug for the in-tank pump. Large pin is the positive. Changed all of the filters; all were pristine and the housings were almost the same. I will re-try the Facet pump [those folks have not returned any of my calls] with filled tubing to see if that makes a difference. Each prior attempt it would lift the fuel only an inch or two from a fuel surface higher than the pump...what's up with that! running out of things to try.
Q: I note that several folks have mounted a Carter pump ?P4260hd? that looks like the one currently in the tank. The Carter site says it is not submersible; has it worked for those who have installed it? If that one works and doesn't break the bank, I'll perhaps try it. I will call Pegasus Racing to see about returning the Facet. Frustrating....