Raw fuel in fuel vapor vent hose.

[Menard666]

2000 5.7l GSi PEFS. Engine is running rich. Fouled a plug ( black, wet with fuel). Four other plugs are black. These were new NGK BPR6EFS gapped to .045". Pulled the vacuum line between fuel cell and tbi and fuel ran out of it. I'm thinking this is not normal? What's my course of action to fix?

 

[Dave Dup]

Re: Raw fuel in fuel vapor vent hose.

There is a float inside the Vapor reservoir tank that is suppose to close a needle valve when the cell is full. You probably should take the top off the pump assembly off and check the float to make sure it's movement is free and not stuck.

 

[Captain Losten Confuzed]

Re: Raw fuel in fuel vapor vent hose.

Before you take things apart, when was the last time the boat had a complete tune up? I'm really bad at jumping the conclusion that somethings wrong just to find out it's a simple case of over looking some required service. You maybe getting the right amount of fuel to each cylinder but not getting a sufficient spark. Also, how old in the fuel in the tank?
I have a clear hose running between the fuel pump and the carb. and it always has a small amount of fuel in it. is that what your talking about?
Start simple and cheap and work your way up to more complex solutions. I could be wrong altogether but when I finally fix the problem I usually have a better running bout due to all the small things that where replaced along the way.

 

[Menard666]

Re: Raw fuel in fuel vapor vent hose.

New plugs, wires, distributor cap & rotor were just installed. Had idle issues before (surging/stalling) that seemed to be fixed with the addition of these parts. Fuel is fresh. Boat is EFI, so no carb it's TBI. Manual says there should be no raw fuel in the line between the throttle body and the fuel pump assembly. I took the line off during troubleshooting and gasoline drained out of it. Am I correct that this line should never have raw fuel in it?

 

[Dave Dup]

Re: Raw fuel in fuel vapor vent hose.

Hello Menard 666,
If this is a vacuum line between the TBI and the top of the fuel cell tank there should not be any gas in the line. This vaccum line removes excess air from the fuel cell (vapor reservoir tank) and prevents vapor locks. When the fuel cell is full then a float inside pushes up a needle valve closing off the fuel from escaping out of the tank into the vaccum line.

 

[Menard666]

Re: Raw fuel in fuel vapor vent hose.

Hello Menard 666,
If this is a vacuum line between the TBI and the top of the fuel cell tank there should not be any gas in the line. This vaccum line removes excess air from the fuel cell (vapor reservoir tank) and prevents vapor locks. When the fuel cell is full then a float inside pushes up a needle valve closing off the fuel from escaping out of the tank into the vaccum line.

Ok! Now we're getting somewhere. Yes it's the vacuum line from the top of the fuel cell tank to the side of the TBI. I pulled the line after I pulled the plugs. Pulled the TBI side off first and nothing came out but when I pulled the line off of the fuel cell side a small amount of gasoline ran out of the vacuum line. This will definitely aid in a rich condition then correct? Solution is to tear down the fuel cell and inspect the float/needle valve then? Are replacement parts available or will I need to replace the entire $6-$700 assembly?

 

[Dave Dup]

Re: Raw fuel in fuel vapor vent hose.

If gas enters the intake manifold it's likely to cause a rich mixture as you noted. Either way gas in this vacuum line should not happen. The needle valve and float check should be the next step. It may just have some crude stuck in the seat or the float may be hung up some how. The only replacement parts I've seen online is the two pumps. Hopefully, you'll find your issue when it's apart.

 

[Sirbb]

Re: Raw fuel in fuel vapor vent hose.

If gas enters the intake manifold it's likely to cause a rich mixture as you noted. Either way gas in this vacuum line should not happen. The needle valve and float check should be the next step. It may just have some crude stuck in the seat or the float may be hung up some how. The only replacement parts I've seen online is the two pumps. Hopefully, you'll find your issue when it's apart.

Did you ever resolver this? if so how? Do you know what is the rubber hose is for, the one in between the 2 hard metal lines in the throttle body?