DWE 0 Report post Posted April 26, 2010 I have a 2004 265 with a 5.7 Volvo GXi and all of a sudden this high pitched squeal or whistle started coming from an area in front of the motor. i had my mechanic come out and he told me that he was certain it was the high pressure fuel pump and volvo also recommended that he replace the anti-syphon valve. he did all of this and it the noise comes back when it reaches operating temp. any ideas as to the possible problem? thanks for any and all input. David Share this post Link to post Share on other sites
boatingboy 0 Report post Posted April 28, 2010 Dave, Try changing the fuel filter. I had a 5.7 gsi that would whine when filter had about 20 hr on it water or sluge from ethenol fuel.. good luck Share this post Link to post Share on other sites
DWE 0 Report post Posted May 3, 2010 Thanks for input, but i did change the fuel filter. also i noticed that when i took the gas cap off, there was a tremendous amount of pressure in the tank. so then i started thinking that my gas tank vent was cloged up. i ran the boat at my dock with the gas cap off and when it got up to normal temp it still made the loud squeal sound. any other suggestions. Share this post Link to post Share on other sites
boatingboy 0 Report post Posted May 3, 2010 Thanks for input, but i did change the fuel filter. also i noticed that when i took the gas cap off, there was a tremendous amount of pressure in the tank. so then i started thinking that my gas tank vent was cloged up. i ran the boat at my dock with the gas cap off and when it got up to normal temp it still made the loud squeal sound. any other suggestions. Dave, try taking belt off and see if noise stops dont run engine too long.. maybe belt or power stearing pump also cheak fuel cooler hose for good water flow.. good luck Share this post Link to post Share on other sites
Ian 0 Report post Posted May 4, 2010 Hi DWE, I'm not a mechanic Not sure if this will help but found similar comments on a fourwinns board http://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=3636 Based on those response and that from boatingbouy, sounds like its something in the fuel system These engines have 2 fuel pumps. A low pressure pump sucks the fuel from the tank. A second high pressure pump is then used to supply the injection system. Seems it can come from either the high pressure pump or the low pressure pump or the filter You said you have replaced the high pressure pump, what about low pressure pump and filter? The 3rd post from the top has a link for the fuel components for a 1999 5.7 Gi / GSi motor. I don't know if it is the same as your year model. It seems unusual that it only does it once the temperature has reached operating range but others have reported it takes a while for the sound to develop. I wouldn't be concerned about the "pressure" in your fuel tank. The "rush" of pressure you experienced when you removed the gas cap is probably just temperature of the air inside the tank warming and expanding. If your high pressure pump was "blowing back", I suspect you'd be having a LOT more troubles than just squeeling. I used to have a 5.0 GXi on another brand of boat but never had any issues with it other than an impellor failure in the seawater pump (engine overheating when over 3000rpm) Hopefully this assists Ian The pressure Share this post Link to post Share on other sites
DWE 0 Report post Posted May 4, 2010 Boating Boy and Ian, thanks for the suggestions and I will try both and will update this thread once i do. thanks again and safe and happy boating. Share this post Link to post Share on other sites
boatingboy 0 Report post Posted May 23, 2010 Boating Boy and Ian, thanks for the suggestions and I will try both and will update this thread once i do. thanks again and safe and happy boating. DWE, check fuel filter housing for paint coming off coud be source of noies Share this post Link to post Share on other sites
DWE 0 Report post Posted June 18, 2010 For what it is worth, it was the low pressure pump which was what i was hoping to avoid as they just raised the price from around $500 to $800.00. runs great now. thanks for those who responded. Share this post Link to post Share on other sites
Ian 0 Report post Posted June 21, 2010 Hi David, OUCH! Isn't boating fun? - lol Thanks for letting us know how it turned out - not too many do Regards Ian Share this post Link to post Share on other sites
RSUMRTOY2 0 Report post Posted June 22, 2010 Like they say...BOAT stands for = BREAK OUT ANOTHER THOUSAND$$$ Share this post Link to post Share on other sites
