Using check valve in YS 140DZ fuel system

[Earl Haury]

In my previous post I assumed that Peter's question was related to using the 
check valve in the vent line as many do. If used in the feed line, Bob is 
correct in that it will stop carb dripping / engine flooding. The pressure 
drop across the YS check valve is negligible and might only affect fuel draw 
if the pump (upper pushrod area) is worn.

Earl

----- Original Message ----- 
From: "Bob Wantz" <rwantz2 at comcast.net>
To: <discussion at nsrca.org>
Sent: Monday, August 30, 2004 7:31 AM
Subject: Re: Using check valve in YS 140DZ fuel system


> I've run the DZ both with and without the check valve and see no ill 
> effects
> with the valve.  In fact, it may run better with the check valve as my 
> idle
> is incredible now and runs have been very consistent even with a very high
> mounted (in the canopy) tank.
>
> ----- Original Message ----- 
> From: "Peter Pennisi" <pentagon.systems at bigpond.com>
> To: <discussion at nsrca.org>
> Sent: Monday, August 30, 2004 6:08 AM
> Subject: Using check valve in YS 140DZ fuel system
>
>
>>
>>
>> Some flying buddies of mine have been having a discussion about using a
>> check-valve in the fuel system to essentially stop fuel from dripping out
> of
>> the vent line. I have been using this system without any problems that I
>> know off for some time. One of the pattern flyers I fly with is very good
>> with engines and he doesn't think it is a very good idea to use the valve
> in
>> the DZ fuel system as the tank will always have a slight pressure build 
>> up
>> inside which may result in inconsistent engine runs. I don't know about
> his
>> theory but I do know that all the Japanese flyers at the recent CAOCC
> event
>> were using check valves in the fuel system.
>>
>> I would be interested to hear from anyone who may have an opinion on this
>> subject.
>>
>>
>> Regards,
>>
>> Peter
>>
>>
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