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1. 01:04 PM - Re: super rich, overfueled CJ (A. Dennis Savarese)
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| Subject: | Re: super rich, overfueled CJ |
Try pulling the fuel shut off lever in the cockpit just prior to shut
down and see if the carburetor still leaks after shut down. That will
shut the fuel off from fuel pump and thus, the carburetor. Hopefully,
the shut off valve arm, which is physically attached to and above the
main fuel screen on the firewall, is adjusted properly. Let us know
what happens when you do that.
Don't forget to push the fuel shut off lever forward before the next
engine start.
A. Dennis Savarese
334-546-8182
www.yak-52.com
On 7/29/2020 2:46 PM, Walter Lannon wrote:
>
> Can't say I know what your problem is but some info and speculation on
> the fuel system may be in order.
>
> 1. Carb. fuel shut-off valve? Not aware of any such valve in the
> carburettor but not an expert on pressure carbs.
>
> 2. The fuel pump is operationally identical to all rotary style
> aviation fuel pumps complete with an internal by-pass and an
> adjustable pressure relief valve that allows excess fuel to circulate
> internally. The pressure will be set to 5 +/- 1 psi (or equiv. in
> metric) --- Any possibility the setting has been compromised ??
>
> 3. The fuel pump installation includes a restrictor installed in the
> outlet port as a safety feature in the event of a hose failure (and
> major fire hazard!) by reducing the output volume. The hole in this
> restrictor is in the order of 0.010". Having seen numerous
> instances where this restrictor has been unknowingly lost with no
> evident effect on carb. function that would not appear to be your
> problem but I suggest you check that in any case.
>
> Cheers;
> Walt
>
>
> -----Original Message----- From: JL2A
> Sent: Wednesday, July 29, 2020 12:47 AM
> To: yak-list@matronics.com
> Subject: Yak-List: super rich, overfueled CJ
>
> <info@flyingwarbirds.com.au.matronics.com>
>
> Does anyone know if the fuel pump used on the HS6A has a minimum
> pressure shut off to prevent over pressure situation between it and
> the carburettor's fuel shutoff valve?
>
> I got one of our carbs overhauled, when we installed it it ran
> extremely rich and would pour 1/4 cup of fuel out of carb on shut down.
>
> We then put the original (working) carb back on and now it does the
> same thing.
>
> Starting to think it is not the carb...
>
> So we replaced the primer (thinking it could have been leaking and
> sucking excess fuel through the prime system). No difference, even
> disconnected the primer line, still got fuel pouring out.
>
> At a loss...
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=497471#497471
>
>
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