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 [Non-text portions of this message have been removed] To unsubscribe from this group, send an email to: DMCForum-unsubscribe@xxxxxxxxxxxxxxx Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
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