Join Date: Aug 2012
Location: Laconia, NH, USA
Fuel Pump Whine
On a long trip during rain I found the rear vent line from the charcoal canister had water. It was causing a vacuum in the fuel tank (whoosh when opening the cover) and the fuel pump to whine ... clearing the line fixed the problem.
Two months later same thing, but canister was waterlogged, blowing in the vent line produced a lot of water coming back out. I did the canisterectomy described on these forums, bringing the tank line down to the right swing arm and plugging the other line with a bolt. Noise went away and all was fine.
After about 500 miles with no canister (and no rain), the fuel pump whine came back, louder than before. There is no vacuum when I open the gas cover, and opening the cover definitely verifies it's the fuel pump, cause the whine noise coming out of the gas tank is LOUD ... sounds like I'm at the dentist office. *edit* my service manager said a plugged vacuum can cause the noise, but other than that he's never heard of an LT fuel pump going bad.
I welcome any ideas on what it is or what I should do next.
Last edited by haunaben; Oct 20th, 2012 at 6:06 pm.