Why does the fuel pump for a Honda GXV630RH has 4 legs of which one is a purge line. What does the purge line do? Btw. Scott I found out where all the fuel lines go but I have a few more questions. There is what seems to be a oil pressure sensor or switch on the right side of the engine (see pic) but it doesn't have a wire on it and I don't see any loose wires hanging around anywhere. The other one is, there is a line coming from the carburetor (#30 on the picture). Where does it go?

Your ^^ post didn't , so..:
 
Why does the fuel pump for a Honda GXV630RH has 4 legs of which one is a purge line. What does the purge line do? Btw. Scott I found out where all the fuel lines go but I have a few more questions. There is what seems to be a oil pressure sensor or switch on the right side of the engine (see pic) but it doesn't have a wire on it and I don't see any loose wires hanging around anywhere. The other one is, there is a line coming from the carburetor (#30 on the picture). Where does it go?
 
The disconnected low oi switch being disconnected won't hurt anything..  Just always make sure the the oil is full..
 
The wire going to the carb (is it a 2 wire with a small plug), is there a solenoid attached to the bottom of the carb?
 
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Yes, there is a solenoid at the bottom of that carburetor but the line I am talking about is not electrical. The #30 line in the diagram that is going to or coming from the carburetor is connected somewhere or maybe not. Mine is about a foot long and just hanging there in the engine compartment. And I am pretty sure that's not correct. I assume it could be a vacuum line, vent line, return line or ???? About the oil switch, I know, maintain proper oil level and the switch is irrelevant. Just curious. It looks like there has never been a wire connected to it. If I could just get my hands on a good electrical schematic for my particular model and year.

There's no picture showing #30..
 
I would follow that wire (pull off the cover) and see where it goes.
You don't know how many folks messed with the machine and not necessarily for the good.
 
Did you look on-line for a shop manual for the machine?
 
 
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Post #10 shows the carburetor diagram and in there it shows the number 30 pointing to a line which goes to the carburetor. The question is where does the other end connect to. Yes I did try to find a shop manual but all i could find are service and owners manuals. I looked at them carefully but couldn't find what i was looking for. I discovered Cub Cadet and Honda to be very poor when it comes to support their products. But I am making progress. The more I dig the more things open up

Scott, I found a great shop manual and I found the answers to my questions. That hose 30 coming from the carburetor is nothing more than a drain hose. The nearly 2 feet of it just hang there open ended pointing to the ground under the engine and allows you to drain the carburetor before removing it and the oil pressure sensor has no wire connected to it, believe it or not.

Did you ever figure out what that 4th line was for the fuel pump?

SRTsFZ6
Did you ever figure out what that 4th line was for the fuel pump?

Yes. it's a purge line. What exactly it purges i don't know, but it goes to a nipple on the air filter box. Probably some CA EPA crap

Yep, agreed...
 
I would try and get the oil pressure switch working.. 
It's a big enough engine it has an oil and thus oil pressure...
 
 
And thanks for the update
 
 

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