"Hi all, I own a Volvo AD31B 1
"Hi all, I own a Volvo AD31B 130hp with DP drive (A2 props), originally the boat was in Bundeburg and would cruise at 16 knots @ 3600 rpm using about 9 lts/hr, top speed about 21 knots at 3900 rpm. Now it resides in Darwin. My problem is the best I can achieve is 3700 rpm at which stage the engine hunts by up to 200 rpm and top speed is about 14 knots, fuel economy is down to about 20 lts/hr. I have reached comparable performance (fuel economy not included) at one stage on a fresh water dam after changing out fuel lines and filters, but the problem returned 1st trip out in the harbor. I have since had the top off the fuel tank and thoroughly cleaned the tank, the Turbo reconditioned, the injectors have just been reconditioned and the lift pump is fine. I have fitted the boat out extensively but don't believe the overall weight is greatly different than when it was used in Bundy.
I will be grateful for any suggestions of what to try next."
"Hi all, I own a Volvo AD31B 130hp with DP drive (A2 props), originally the boat was in Bundeburg and would cruise at 16 knots @ 3600 rpm using about 9 lts/hr, top speed about 21 knots at 3900 rpm. Now it resides in Darwin. My problem is the best I can achieve is 3700 rpm at which stage the engine hunts by up to 200 rpm and top speed is about 14 knots, fuel economy is down to about 20 lts/hr. I have reached comparable performance (fuel economy not included) at one stage on a fresh water dam after changing out fuel lines and filters, but the problem returned 1st trip out in the harbor. I have since had the top off the fuel tank and thoroughly cleaned the tank, the Turbo reconditioned, the injectors have just been reconditioned and the lift pump is fine. I have fitted the boat out extensively but don't believe the overall weight is greatly different than when it was used in Bundy.
I will be grateful for any suggestions of what to try next."