AED 850HO

I'm no carb expert, in fact this is the first time I've used a carb in over 40 years.

I've got an AED 850HO bolted on to my fresh built 455. Worked fine during cam break in but on coming back to it today the front float doesnt appear to be working and fuel is coming out of the part circled in red below.

Apologies for my lack of knowledge as to what this parts is called.

 

That part is the rear vent tube. Do you mean the front one? That means the float level is set too high

 

Or there could be something stuck in the needle an seat, dirt, small piece of teflon tape. Best to remove the bowl, remove the needle and seat an verify and reset.

Dont just assume it's only a float level adjustment

Your carb appears to sight glass windows.....set float level about 25% of the way up the window.


To remove the needle and seat just loosen the hex nut and turn it out......you adjustment level wont be effected....
To adjust you need to hold the hex nut and loosen the jam screw with a thick bladed flat screw drive....then turn the hex nut..

 

@johnriv67 thanks, I do mean the front one.

@Bens99gtp I'll do as you suggest

 

@johnriv67
@Bens99gtp

Thanks gents, turned out to be a stuck float needle, small piece of teflon wedged in there. Float level now set just under half way up the float glass.

 

Love being right.......dont ask me how I knew teflon would be there

 

OK I wont...........nope still not going to ask............oh go on tell me!!!!

 

Well......I dont normally use teflon tape, I use the liquid stuff.

I was work on the 90 as truck we did a few years ago, putting a nice about 650hp aluminum headed 502 in. The customer very adamant about only using this blue color very thick tape on the fitting. He provided it and said he has had nothing but trouble with all other forms........the bypass regulator was pipe threads so 3 wraps on each fitting per his very specific instructions.

About a week later after he gets it back he has your complaint, so I drive the hr to his house, pull the needles to find both full of blue tape that clearly got cut during the install.

So a quick clean up, and he was back underway

 

Teflon (PTFE) tape has NO place in a fuel system; or an oil system. If it doesn't shred and cause problems when installed...it'll shred and cause problems when disassembled.

God Bless Loctite/Permatex "PST", Pipe Sealer with Teflon. The important part is that it has an anaerobic chemical like a thread-locker in addition, so that it HARDENS (not just "dries") in the absence of air. FANTASTIC stuff. There's multiple versions: "High heat", low strength, slow-setting, etc; and they all work. The three most common are #565, #567, and #592. 592 is the easiest to source around here, and generally costs a little less than 567.

https://www.amazon.com/dp/B0002KKTH...olid=2VLYZKC3HBBDO&psc=1&ref_=lv_ov_lig_dp_it

 

Interestingly I didn't use PTFE tape, I used loctite.

I'm assuming the Teflon came from the fuel line which is Teflon lined

 

Steel-braid-over-Teflon (PTFE) liner?

Stray pieces of Teflon are possible, but somewhat rare. Even more rare if the hoses are cleaned-up after assembly by blowing compressed air through them. We had a steel-bladed saw (think of a table-mounted fixture with a circular saw using a sharp, steel blade having no "teeth".) When the blade got dull, it would make more-ragged cuts with bits of rubber or Teflon left inside the hose.

 

Yes, it was a small sliver no more than 0.020"

 

Glad you found it and was an quick repair