Not unusual to see a little water and debris in bottom of float bowl.
presence of some crap in the bowl may not indicate that’s the cause of your issues.
Fly it carefully till you confirm you’ve found the problem.
I've had that happen. The intake valve suddenly jammed open which backfired through the intake snuffing out the engine. Gets very quiet.One other thought is a sticking intake valve or intake valve spring
You want to do a flow test with the plane in the most adverse position. That means tail very low at the very least. Preferably done on a slope with the nose high.So raise the tail to level flight and check the GPM flow at the carb fuel line ,
Increase the size of the fuel lines by 125%.
Sounds to be too low. Do you have the pressurized fuel cap vents? That will help.About 7 days to final inspection on my Experimental Super Cub, with a Titan IO-370, with electronic mags. Checked gravity fuel flow in a 3 point attitude at the inlet of the Aeromotive Silver Hawk, and got 17 gal per hour, from both tanks. Have read where it should be a certain amount above highest consumption, which I suppose would be about 15 or so an hour. Does this sound like the correct flow. Using 3/8 fuel lines. Thanks
3.435 Fuel flow rate for pump systems. The fuel flow rate for pump systems (main and reserve supply) shall be 0.9 pound per hour for each take-off horsepower or 125 percent of the actual take-off fuel consumption of the engine, whichever is greater. This flow rate shall be applicable to both the primary engine-driven pump and the emergency pumps and shall be available when the pump is running at the speed at which it would normally be operating during take-off. In the case of hand-operated pumps, this speed shall be considered to be not more than 60 complete cycles (120 single strokes) per minute.
Given that the Silver Hawk is an injection servo, and that this airplane probably has 2 fuel pumps, wouldn't the required test be with a single pump running rather than a gravity feed test? If both pumps fail the engine is going to quit no matter how fast the gravity feed.
Just asking.
[FONT="]Trial #[/FONT] | [FONT="]Volume (ml)[/FONT] | [FONT="]Measured Time (sec)[/FONT] | [FONT="]Adjusted Time (sec)[/FONT] | [FONT="]Adjusted ml/sec[/FONT] | [FONT="]Adjusted gal/hr*[/FONT] |
[FONT="]1[/FONT] | [FONT="]218[/FONT] | [FONT="]7.6[/FONT] | [FONT="]7.1[/FONT] | [FONT="]30.7[/FONT] | [FONT="]29.1[/FONT] |
[FONT="]2[/FONT] | [FONT="]219[/FONT] | [FONT="]8.9[/FONT] | [FONT="]8.4[/FONT] | [FONT="]26.1[/FONT] | [FONT="]24.8[/FONT] |
[FONT="]3[/FONT] | [FONT="]215[/FONT] | [FONT="]9.1[/FONT] | [FONT="]8.6[/FONT] | [FONT="]25.0[/FONT] | [FONT="]23.8[/FONT] |
[FONT="]4[/FONT] | [FONT="]210[/FONT] | [FONT="]7.7[/FONT] | [FONT="]7.2[/FONT] | [FONT="]29.2[/FONT] | [FONT="]27.8[/FONT] |
[FONT="]Average[/FONT] | [FONT="]26.4[/FONT] |
Sounds to be too low. Do you have the pressurized fuel cap vents? That will help.
This is the FAA requirement for certified airplanes:
CAR 3
3.434 Fuel flow rate for gravity feed systems. The fuel flow rate for gravity feed systems (main and reserve supply) shall be 1.2pounds per hour for each take-off horsepower or 150 percent of the actual take-off fuel consumption of the engine, whichever is greater.
3.435 Fuel flow rate for pump systems. The fuel flow rate for pump systems (main and reserve supply) shall be 0.9 pound per hour for each take-off horsepower or 125 percent of the actual take-off fuel consumption of the engine, whichever is greater. This flow rate shall be applicable to both the primary engine-driven pump and the emergency pumps and shall be available when the pump is running at the speed at which it would normally be operating during take-off. In the case of hand-operated pumps, this speed shall be considered to be not more than 60 complete cycles (120 single strokes) per minute.
Is that prop a constant speed or ground adjustable? Adjust the low pitch stop to a lower blade angle for more static rpm. If it has a governor, back out the high rpm stop screw for more rpm.Note the engine runs fine with no fuel pump on, but will not turn up full static RPM. View attachment 56959
Thanks for the reply
Note the engine runs fine with no fuel pump on, but will not turn up full static RPM.
Do the flow test again with the electric pump running. You will likely be happy with the results.Fuel flow was gravity only no pump.
If the fuel pump fails at wot, you just turn on the boost pump. That is what it is for.Did the fuel flow yesterday with the boost pump on, it nearly doubled the flow, about 31 gal an hour. That meets all the requirements mentioned. Still concerned if wot and fuel pump failed. Will keep working on getting the gravity flow up, but for now, the boost pump did the job.
Really appreciate the advise and comments