Hi,
I have a:
- 2000 Aquasport Osprey Sport 215
- 2000 Mercury 200 hp Optimax.
- 100 gal Moeller fuel tank model FT 9902 built-in under the deck. Tank has a molded nipple for the fill hose, a molded nipple for the vent hose and a 90 degree fitting with shut-off valve on fuel supply port. The vent hose runs along side the fill hose under the floor, up the side of the boat and both attach up on the side of the hull to the fill / vent combination fitting that is then capped with the screw on fuel cap.
I?ve never had any issues with anything until last week. After running the engine for awhile it suddenly cuts out completely. I believe I am getting a vacuum lock and no fuel is reaching the engine.
After the engine cut out I disconnected the vent hose from the molded nipple on the fuel tank and a lot of air vented from the tank. I then disconnected the vent hose at the fill cap and blew air into that end of the hose. When I did this gas came pouring out of the other disconnected end of the vent hose down at the fuel tank. So I am thinking now for some reason there is suddenly a low spot in the vent hose under the floor somewhere that is trapping the gas and causing the vacuum lock. I blew compressed air through the vent hose so I am certain there is no obstruction in the hose and I am assuming there is a low spot somewhere.
Yesterday after the engine cut out again I left the vent hose disconnected so I could slowly get back to port. When I did this I noticed that at times gas would come out of the vent port and onto a rag I put down. So again I am assuming this gas was getting trapped in the hose at a low spot somewhere. I am going to try to pull the hose tighter to get rid of the low spot but access is very hard under the floor.
My questions are:
- Does this seem like a reasonable explanation as to why the engine is cutting out?
- Is it normal for some gas to come out of the vent nipple and into the vent hose? There is no check valve or anything in the vent port on the fuel tank?
- Like I said the vent hose runs alongside the fill hose and up to the vent / fill combination fitting. But when the fuel cap is on the combination fitting that vent hose seems like it would be sealed by the cap and therefore not truly vented. Am I missing something here? Again this has worked this way for 10 years with no issues.
- Any other suggestions as to what is going on and what I should do?
Thank you very much for any help.
I have a:
- 2000 Aquasport Osprey Sport 215
- 2000 Mercury 200 hp Optimax.
- 100 gal Moeller fuel tank model FT 9902 built-in under the deck. Tank has a molded nipple for the fill hose, a molded nipple for the vent hose and a 90 degree fitting with shut-off valve on fuel supply port. The vent hose runs along side the fill hose under the floor, up the side of the boat and both attach up on the side of the hull to the fill / vent combination fitting that is then capped with the screw on fuel cap.
I?ve never had any issues with anything until last week. After running the engine for awhile it suddenly cuts out completely. I believe I am getting a vacuum lock and no fuel is reaching the engine.
After the engine cut out I disconnected the vent hose from the molded nipple on the fuel tank and a lot of air vented from the tank. I then disconnected the vent hose at the fill cap and blew air into that end of the hose. When I did this gas came pouring out of the other disconnected end of the vent hose down at the fuel tank. So I am thinking now for some reason there is suddenly a low spot in the vent hose under the floor somewhere that is trapping the gas and causing the vacuum lock. I blew compressed air through the vent hose so I am certain there is no obstruction in the hose and I am assuming there is a low spot somewhere.
Yesterday after the engine cut out again I left the vent hose disconnected so I could slowly get back to port. When I did this I noticed that at times gas would come out of the vent port and onto a rag I put down. So again I am assuming this gas was getting trapped in the hose at a low spot somewhere. I am going to try to pull the hose tighter to get rid of the low spot but access is very hard under the floor.
My questions are:
- Does this seem like a reasonable explanation as to why the engine is cutting out?
- Is it normal for some gas to come out of the vent nipple and into the vent hose? There is no check valve or anything in the vent port on the fuel tank?
- Like I said the vent hose runs alongside the fill hose and up to the vent / fill combination fitting. But when the fuel cap is on the combination fitting that vent hose seems like it would be sealed by the cap and therefore not truly vented. Am I missing something here? Again this has worked this way for 10 years with no issues.
- Any other suggestions as to what is going on and what I should do?
Thank you very much for any help.