sailmaster
Recruit
- Joined
- Jun 8, 2016
- Messages
- 2
Having trouble with fuel pressure on low pressure side.
Tested pressure and big drops to very low at speeds over 2000 RPM
Replaced low pressure fuel Pumps and gaskets. Yamaha Parts through Iboats
Same problem
Checked fuel feed system with vacuum gauge. Less than 3" vacuum
Same problem
Ran on known remote tank hooked directly to fuel filter intake on engine filter
Same problem.
Messed around with old removed pumps and found one could be blown through in both directions
Checked new fuel pumps and neither one holds 4 PSI vacuum
one pump actually allows air to be blown through very slightly. Removed that one and replaced with the one that holds a bit of vacuum
Ran at 4000 RPM for 3 minutes All is Good
Let engine idle to cool for 10 minutes and the pressure is now under 35 and drops with any throttle increase
Same problem
Tested pressure and big drops to very low at speeds over 2000 RPM
Replaced low pressure fuel Pumps and gaskets. Yamaha Parts through Iboats
Same problem
Checked fuel feed system with vacuum gauge. Less than 3" vacuum
Same problem
Ran on known remote tank hooked directly to fuel filter intake on engine filter
Same problem.
Messed around with old removed pumps and found one could be blown through in both directions
Checked new fuel pumps and neither one holds 4 PSI vacuum
one pump actually allows air to be blown through very slightly. Removed that one and replaced with the one that holds a bit of vacuum
Ran at 4000 RPM for 3 minutes All is Good
Let engine idle to cool for 10 minutes and the pressure is now under 35 and drops with any throttle increase
Same problem
| PXMKG515D101 | YAMA 200 | 6G6 X 104618 | Z200TXRZ | 03/01 |