eze2bme
Well-known member
- Joined
- Apr 12, 2005
- Messages
- 880
- Hatteras Model
- 43' DOUBLE CABIN (1970 - 1984)
Following is a copy of an article in this month's issue of BOAT/US magazine relating to ethanol and fiberglass tanks:
"Older fiberglass gas tanks may fail or cause engine damage when filled with gasoline formulated with ethanol, according to damage reports collected by BoatU.S.
BoatU.S. has learned of more than 30 cases of fiberglass gas tanks manufactured before the mid-1980s that produced an engine killing sludge or began leaking after being filled with 10% ethanol gasoline.
The investigation is ongoing, but it appears that 10% ethanol gasoline, which was introduced in the Long Island area to replace gas additive MTBE in late 2004, may be attacking the resins used in older fiberglass gas tanks. These tanks were standard equipment on some Hatteras and Bertram models and may be present on other boats of the same era. Diesel tanks are not affected.
The engine damage appears to be due to a tar-like substance - possibly from the chemical reaction between the resin and ethanol - causing hard black deposits that damage intake valves and push rods, ultimately destroying the engine. Early symptoms may include engine backfiring and hard or sluggish starting in which the engine turns over slowly. Affected engines may not reach their rated rprn.
Fuel filters have not captured the substance. The only way to know for certain is to pull the carburetor and inspect the underside for a black, gummy film.
BoatU.S. has also confirmed reports of tank wall failure in some of these tanks in which gasoline was found leaking into the bilge. At press time BoatU.S. was awaiting the results of laboratory experiments to determine the exact cause of the problem.
New York and Connecticut boat owners have reported the majority of problems, along with one owner in California. Ethanol and MTBE are used to oxygenate gas to reduce harmful emissions. MTBE has been banned in half the states.
Anyone who has experienced these problems should send details to BoatU.S. at cfort@boatus.com."
"Older fiberglass gas tanks may fail or cause engine damage when filled with gasoline formulated with ethanol, according to damage reports collected by BoatU.S.
BoatU.S. has learned of more than 30 cases of fiberglass gas tanks manufactured before the mid-1980s that produced an engine killing sludge or began leaking after being filled with 10% ethanol gasoline.
The investigation is ongoing, but it appears that 10% ethanol gasoline, which was introduced in the Long Island area to replace gas additive MTBE in late 2004, may be attacking the resins used in older fiberglass gas tanks. These tanks were standard equipment on some Hatteras and Bertram models and may be present on other boats of the same era. Diesel tanks are not affected.
The engine damage appears to be due to a tar-like substance - possibly from the chemical reaction between the resin and ethanol - causing hard black deposits that damage intake valves and push rods, ultimately destroying the engine. Early symptoms may include engine backfiring and hard or sluggish starting in which the engine turns over slowly. Affected engines may not reach their rated rprn.
Fuel filters have not captured the substance. The only way to know for certain is to pull the carburetor and inspect the underside for a black, gummy film.
BoatU.S. has also confirmed reports of tank wall failure in some of these tanks in which gasoline was found leaking into the bilge. At press time BoatU.S. was awaiting the results of laboratory experiments to determine the exact cause of the problem.
New York and Connecticut boat owners have reported the majority of problems, along with one owner in California. Ethanol and MTBE are used to oxygenate gas to reduce harmful emissions. MTBE has been banned in half the states.
Anyone who has experienced these problems should send details to BoatU.S. at cfort@boatus.com."