Hello All,
Just wanted to share my experience with disappearing fuel. I had a
'67 Imperial Crown and found that the fuel would disappear from the filter and
inlet line to the carb after sitting for a couple of days. After about two
months, I went to change the engine oil and was very surprised to see the oil
level several quarts ABOVE full. The diaphragm in the fuel pump had gone
bad allowing the fuel to leak into the oil pan. After a new fuel pump (and
oil change), the fuel disappearance problem had, well, disappeared. Now,
whenever anyone says fuel is disappearing, I ask them to check the oil.
Thanks!
Randy
----- Original Message -----
Sent: Tuesday, August 30, 2005 5:59
PM
Subject: Re: IML: Fuel Siphoning
I can say that when the cars were new, or at least much younger
than they are now, they were not hard to start unless they were parked for a
VERY long time. Several of mine will still start very quickly, even if they
have been parked for a month or two.
Two of my cars with Carters that
are giving this trouble have clogged primer jets. My '63 was this way. I was
able to remedy it (on the advice of a friend) by using a piece of very fine
wire to clear through the opening in both jets. They are visible in the top
front portion of the carb. Once open, I can see them spray when I pull on the
throttle. They become clogged due to rotten gas sitting in the
carb.
The '68 has an original Holley. I have not studied it to
determine if it could have a similar problem as above. The car has a brand new
fuel pump. Since you say that the fuel pump's built in check valve should
prevent it, I will guess that the fuel in the line is not running back from
there into the tank. I could install a filter with a check valve, but have not
yet done so.
I'll bite, yes, I would like to know, where does the fuel
in the '68's fuel line go? I have a glass in-line filter that I can see is
empty after the car sits overnight. Some of my other cars retain fuel (visible
in the filter) for periods much longer than a few days. I can imagine that if
there are some bad seals in the carb (or someplace), the conditon could allow
enough air exposure to hasten it to evaporate. Is it possible that the fuel in
the line is hot enough to have expanded to the point that it would nearly
disappear once cooled off?
This inquiring mind wants to
know.
Paul W.
In an email dated 31/8/2005 1:02:05 am GMT
Daylight time, "mike and linda sutton" <mikanlin62@xxxxxxxxxxx>
writes:
>Today there was a post about fuel siphoning back thru the
needle and seats
>after the car was shut down. It did not mention
whether is was a Holley or
>Carter carb, but since this is the Imperial
list, we can presume it is an
>Imperial and probably an AFB or a
Holley, at the long shot a thermoquad.
>Before going any further, it is
not my intent to start a flame war or a
>peeing match about this, and
that I do in fact respect the person who made
>the post and that Im not
disputing their knowledge or experience.
>
>Having said all that,
this has been cussed and discussed , peted and
>repeated many times on
this list. The general complaint is the excessive
>cranking required in
some Imperials before they will start, and is generally
>attributed to
lack of fuel in the float bowls. The causes , in no
>particular order ,
have been attributed to heat soak after shut down causing
>fuel to boil
off in the bowl, leaks from porosity or cracks , and the
>difference in
todays fuels versus the fuels of the past in how easily the
>evaporate.
>
>Now, my question...HOW can fuel siphon back
thru a needle and seat after
>shut down. The needle and seat are higher
than the level of fuel in the
>bowl and once the fuel pump was to stop
pumping, the column of fuel
>contained in the line to the needle and
into the bowl would cease to be
>filled completely full , which would
not let a siphon action occur. Also,
>the check valves in the fuel pump
should stop it from flowing backwards any
>further than the pump. I
cant believe that there are that many Imperials
>running around with
fuel pumps with this condition. I have analyzed this 6
>ways to Sunday
and I just cant get there from here. This should be in the
>archives,
so feel free to dispute me all you please, I just want to see an
>explanation for this phenomenon.
>
>I know the problem is
real enough, it happens on my 62 now and then. I have
>installed opaque
fuel filters in the line to the carb and watched the fuel
>in the line
before. There is always a bit of an air pocket in the filter
>when I
shut the car off, but the level never drops down completely. That in
>itself dispels the siphon theory as far as I can
see
>
>Ok, inquiring minds want to
know??
>
>Mikey
>62 Crown Coupe
>
>
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