Re: [DMCForum] fuel system question

["id" <ionicdesign@xxxxxxxxxx>]

WOW!
best reason for the accumulator i heard so far, and the smartest
description. i am inpressed with you walt.

mark

Walter Coe wrote:

>  Not to negate anyone else's explanation, here is mine:
>
> The accumulator has 3 connections.  Two of them take threaded fittings
> and
> the other is a hose barb.  The threaded ports are connected together,
> i.e.,
> they go to the same place.  They could have made it just as well with
> one
> port and used an external T-fitting, but the way they did it requires
> less
> parts.
>
> The way the accumulator works is very similar to a bladder tank on a
> household well system or lawn sprinkler system.  If you understand
> these
> then enough said, if not then forget I mentioned it. :-)
>
> I enjoy parables as does God in the bible, so I'll use one here to
> preach
> Bosch righteousness.  Picture the accumulator as being a balloon on
> the side
> of a T-fitting tapped into the fuel supply line.  As the fuel line
> reaches
> maximum pressure when you start the car from cold, the balloon
> inflates.  If
> the fuel pressure fluctuates for any reason, the balloon expands or
> contracts to help regulate the pressure.  In the case of a real
> accumulator,
> the balloon is a diaphragm with a spring behind it.  If the diaphragm
> develops a leak, then it is plumbed back to the fuel tank via the low
> pressure return line.  That is what the hose barb on the other end is
> for.
>
> When the accumulator is working properly, the spring & bladder
> maintains the
> fuel pressure in the system.  This is especially important when the
> engine
> is hot and not running.  The place where fuel enters the engine is hot
>
> enough to boil the fuel if it were at atmospheric pressure.  By
> keeping it
> under pressure, this stops the fuel from boiling.  Remember Boyle's
> Law from
> high school physics?  If it did boil, there would be fuel vapor
> bubbles in
> the engine.  And the fuel injectors are made to take liquid fuel --
> not
> vapor.  This is where the hot start problems come from.
>
> Cool eh?
>
> Walt


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