Fuel Pump Vent Tube

[saxman9801]

I have a little bit of a thicker dark red colored liquid in the tube running from my mechanical fuel pump up to the carb, it is not a lot just a very small amount right where the hose leaves the pump. Is this normal and If not what causes it and if the pump needs replaced is there a difference between a marine fuel pump and auto pump? As stated it is a mechanical pump on a 5.7.

 

[dgopetactical]

Re: Fuel Pump Vent Tube

I have a little bit of a thicker dark red colored liquid in the tube running from my mechanical fuel pump up to the carb, it is not a lot just a very small amount right where the hose leaves the pump. Is this normal and If not what causes it and if the pump needs replaced is there a difference between a marine fuel pump and auto pump? As stated it is a mechanical pump on a 5.7.

A fuel/fume tube is part of the marine design to provide a safe fuel exit in the unlikely event of a diaphragm rupture, there should not be anything in this tube and if you are having a diaphragm issue there should be no red fluid in it just gas.

Have you added any type of treatment to your fuel that would make it red??? have you sprayed or poured anything into the carb of that color that a small ammount went down the tube??

Dont replace your fuel pump yet. disconect the tube on both end clean it out and blow in it to dry it out reconnect it and try again..this is not normal and should never be happening so I doubt it is a fuel pump issue unless you have red gas

I have a 5.7 and the only place I have any red fluid is in the power steering pump, trim tab pump and they have no connection to the fuel pump. Yes there is a difference between a auto and marine fuel pump.
Denny

 

[Gary H NC]

Re: Fuel Pump Vent Tube

Maybe from Stabil fuel treatment? It should not be in that line though..


Good advice though,
Clean it out and keep an eye on it..

 

[dgopetactical]

Re: Fuel Pump Vent Tube

Maybe from Stabil fuel treatment? It should not be in that line though..


Good advice though,
Clean it out and keep an eye on it..

thats what I was thinking at first....I put stabil in my fuel cans and it never turned the fuel red..........this is a weird situation I have never heard that before.....I have heard of people using ATF to fog their engine and or use it a cleaner for the carb/engine while the engine is running maybe some of that got in the tube............dono... thats a weird one..... ...Im tink'n accidental human contamination not mechanical.
Denny

 

[saxman9801]

Re: Fuel Pump Vent Tube

I would agree that the color is weird. There was some stabil in the tank at one point in time but it actually made the gas more of a yellowish color. I am thinking whoever suggested something got in there is probally right. I did have the carb off while putting the new on and it's possibile that it could have had something get in there. I'll check it out and go from there.