FPE 5.8 Fuel delivery problem...help plz

Neogenesis · 07-06-2006, 10:30 AM

Hey all,

I've got a FPE 5.8 that I'm having a bit of a problem with. The engine starts great, runs great, but when thrown into a hard snap or a blender, the engine nearly quits until the snap or spin slows down. No matter if I give it throttle or not before the I enter the manuver, there is no throttle response during it. I have tried a check vlave thinking that possible it's pulling fuel back from the carb, but that didn't help, and I really don't know where else to look from here.

Thoughts or idea's anyone?

Thanks,

Neo

Scat-R-D · 07-06-2006, 10:56 AM

Sounds like your fuel is being thrown to the front of the tank and the clunk isn't following it.
I'd pull the tank and make sure the clunk is moving forward with the fuel.
If it's not try a thinner/more flexable line or a heavier clunk.

Neogenesis · 07-06-2006, 11:55 AM

It does it with a full or empty tank. I may just go nd buy a new tank and install it. I really don't think that's the problem, but it is possible.

Neo

Dan767 · 07-06-2006, 12:37 PM

If you fly a Knife Edge and the engine wants to quit as well, I would guess and say that your mixture (high) is rich. Could you possibly try using a higher idle (use an idle down setting for landing) and see if that helps as well?

Neogenesis · 07-06-2006, 12:58 PM

Flying knife edge or inverted no problem. Higher idle doesn't help either. As soon as I hit the snap......there is nothing there. High or low idle.

Neo

Dan767 · 07-06-2006, 03:39 PM

What airplane is this on? Do you have the velocity stack on? The only other thing I can think of, is during the snap/blender mnauevers, a vacuum is being created and it's causing the problem. Don't know if turning the velocity stack 90 degress (if it's on) or putting the stack on would help. I don't know of anyone using a brass fitting on the carb with a line to the fuse with this engine either. Wish I was more help.

Dan

Jaybird · 07-06-2006, 07:38 PM

It sounds lean on the low end. I had an airplane do the exact same thing, It would dead stick every time I put it into a blender.

Huckeneer · 07-12-2006, 09:52 PM

Thats what mine did too until i richened the low end. I have had 4 dead sticks happening from flat spins and knife Edge spins. Neo.... Look on FPE site and look at the Owners manual, I believe I saw some trouble shooting help that explains your problem and what might be wrong. Let me know if this helps.
Jamie

07-06-2006, 10:30 AM	#1 (permalink)
Neogenesis Down Low..Too Slow..DOH!! Join Date: Jan 2006 Location: Findlay, OH Posts: 1,014	FPE 5.8 Fuel delivery problem...help plz Hey all, I've got a FPE 5.8 that I'm having a bit of a problem with. The engine starts great, runs great, but when thrown into a hard snap or a blender, the engine nearly quits until the snap or spin slows down. No matter if I give it throttle or not before the I enter the manuver, there is no throttle response during it. I have tried a check vlave thinking that possible it's pulling fuel back from the carb, but that didn't help, and I really don't know where else to look from here. Thoughts or idea's anyone? Thanks, Neo __________________ Fly it like you stole it!!!

07-06-2006, 10:56 AM	#2 (permalink)
Scat-R-D Gettin' Lower! Join Date: Jan 2006 Location: Round Rock, Texas Age: 43 Posts: 49	Re: FPE 5.8 Fuel delivery problem...help plz Sounds like your fuel is being thrown to the front of the tank and the clunk isn't following it. I'd pull the tank and make sure the clunk is moving forward with the fuel. If it's not try a thinner/more flexable line or a heavier clunk.

07-06-2006, 11:55 AM	#3 (permalink)
Neogenesis Down Low..Too Slow..DOH!! Join Date: Jan 2006 Location: Findlay, OH Posts: 1,014	Re: FPE 5.8 Fuel delivery problem...help plz It does it with a full or empty tank. I may just go nd buy a new tank and install it. I really don't think that's the problem, but it is possible. Neo __________________ Fly it like you stole it!!!

07-06-2006, 12:37 PM	#4 (permalink)
Dan767 Say again, you're garbled Join Date: Jan 2006 Location: Federal Way, WA Posts: 784	Re: FPE 5.8 Fuel delivery problem...help plz If you fly a Knife Edge and the engine wants to quit as well, I would guess and say that your mixture (high) is rich. Could you possibly try using a higher idle (use an idle down setting for landing) and see if that helps as well?

07-06-2006, 12:58 PM	#5 (permalink)
Neogenesis Down Low..Too Slow..DOH!! Join Date: Jan 2006 Location: Findlay, OH Posts: 1,014	Re: FPE 5.8 Fuel delivery problem...help plz Flying knife edge or inverted no problem. Higher idle doesn't help either. As soon as I hit the snap......there is nothing there. High or low idle. Neo __________________ Fly it like you stole it!!!


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07-06-2006, 03:39 PM	#6 (permalink)
Dan767 Say again, you're garbled Join Date: Jan 2006 Location: Federal Way, WA Posts: 784	Re: FPE 5.8 Fuel delivery problem...help plz What airplane is this on? Do you have the velocity stack on? The only other thing I can think of, is during the snap/blender mnauevers, a vacuum is being created and it's causing the problem. Don't know if turning the velocity stack 90 degress (if it's on) or putting the stack on would help. I don't know of anyone using a brass fitting on the carb with a line to the fuse with this engine either. Wish I was more help. Dan

07-06-2006, 07:38 PM	#7 (permalink)
Jaybird Shake and Bake Join Date: Jan 2006 Location: Jay Florida Age: 34 Posts: 1,228	Re: FPE 5.8 Fuel delivery problem...help plz It sounds lean on the low end. I had an airplane do the exact same thing, It would dead stick every time I put it into a blender.

07-12-2006, 09:52 PM	#8 (permalink)
Huckeneer Bad-ass Super Contributer! Join Date: Jan 2006 Location: Flippin Cold, Ohio Age: 18 Posts: 1,051 Blog Entries: 2	Re: FPE 5.8 Fuel delivery problem...help plz Thats what mine did too until i richened the low end. I have had 4 dead sticks happening from flat spins and knife Edge spins. Neo.... Look on FPE site and look at the Owners manual, I believe I saw some trouble shooting help that explains your problem and what might be wrong. Let me know if this helps. Jamie

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