Fuel Tank Ventilation Issue (SOLVED)

Capt.Will

Active Member
Aug 15, 2016
148
Lake St. Clair
Boat Info
1997 Sea Ray 330 Sundancer
Engines
7.4 MPI Mercruiser Inboards
Vessel: 1997 Sea Ray Sundancer 330
Engines: 1997 7.4L Mercury Bluewater MPI

Issue: Ever since I purchased the boat when filling the STD tank with fuel, I could never fill the tank at a higher/normal pressure rate or it would back wash out the fuel fill and create a mess.

I finally figured out the location of the vent hose. After taking apart the inside of the slider storage compartment in the mid cabin, I found the 2' hose wrapped in a plastic cover and zip tied in a manner that caused the hose to kink. In the photo you will see the kink. It was much worse with the tight zip ties and cover. This photo was after I cut the zip ties to reveal it.

This had to have been from the manufacture install. Over time it just progressed and kinked even further. I replaced the hose and oriented it so it will not kink. PROBLEM SOLVED. Such relief.
IMG_0532.jpeg
 
So the way that that hose SHOULD have been installed (whether from the factory or a previous messing around in there) is with an UPWARD loop. Meaning the hose, as it comes off the fitting should go upwards into a loop and then down to the tank. When you re-did this, did you duplicate that? If not, you'll want to fix it to avoid getting water in your fuel.

When you reoriented it, where you careful to avoid the possible standing water in the hose from draining down into the tank?

But... good find!
 
So the way that that hose SHOULD have been installed (whether from the factory or a previous messing around in there) is with an UPWARD loop. Meaning the hose, as it comes off the fitting should go upwards into a loop and then down to the tank. When you re-did this, did you duplicate that? If not, you'll want to fix it to avoid getting water in your fuel.

When you reoriented it, where you careful to avoid the possible standing water in the hose from draining down into the tank?

But... good find!

I did replace it. I didn't want to take a chance on this happening again because it isn't the easiest thing to get to removing all the panels. I did loop it in a similar manner but raising it up further and zip tying it making sure that it doesn't fold the loop down again. I am very confident that it will work correctly and not let water in.
 
I did replace it. I didn't want to take a chance on this happening again because it isn't the easiest thing to get to removing all the panels. I did loop it in a similar manner but raising it up further and zip tying it making sure that it doesn't fold the loop down again. I am very confident that it will work correctly and not let water in.
Good job sir.
 
I had this same issue on a brand new SLX delivered last summer. Took about 45 mins and a very sore wrist to fill the tank slowly enough that it didn’t back flow or trip the fuel nozzle.

Luckily the dealer warranty service tech figured it out right away. They reached out to Sea Ray to get a schematic of the proper hose routing and re-ran it accordingly. No issues since.
 
I had this same issue on a brand new SLX delivered last summer. Took about 45 mins and a very sore wrist to fill the tank slowly enough that it didn’t back flow or trip the fuel nozzle.

Luckily the dealer warranty service tech figured it out right away. They reached out to Sea Ray to get a schematic of the proper hose routing and re-ran it accordingly. No issues since.
On a new boat? Crazy.
 
I don't see that Loop serving any purpose at all. The the two boats that I own with original vent hoses have no loops
 
I don't see that Loop serving any purpose at all. The the two boats that I own with original vent hoses have no loops
I am assuming that the loop is there to stop any fuel splash up and out the vent vs. a straight hose that would be only a few inches to the vent. If the tank is full I can imagine that could be an issue. Not 100% on that assumption but it's possible I suppose.
 
I am assuming that the loop is there to stop any fuel splash up and out the vent vs. a straight hose that would be only a few inches to the vent. If the tank is full I can imagine that could be an issue. Not 100% on that assumption but it's possible I suppose.
It's about water splashing in. See post #3.
 
^^^ What he said..
 

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