[DML] Re: The great vapor lock controversy (Elvis Nocita)

["content22207" <brobertson@xxxxxxxxxxxx>]

It makes perfect sense now that I think about it. The short burst of
pump activity when the car is first energized must be the reset
interval for the RPM relay timer chip. It's about half a second long
(perhaps even closer to .75 seconds). The engine isn't turning at that
point, so the relay obviously opens thereafter. 

You can't hear the pump while the starter motor is turning, but I bet
if you put a meter on it you'd see continuous activity.

I'm fortunate that the fuel bowl of my DeLorean carburetor is
extremely well vented. With the advent of US emissions, some later
carb designs were much more congested. For example, the Carter YFB on
one of my trucks is vented back into the throat, I guess so fuel
vapors will be burned within the engine. It's a nice idea, but the
rebuilt carb I installed some time ago was machined on the bottom,
making those vent passages so small that a traditional gasket will
expand into them and choke them off. The only way I can run it is with
a home made cereal box gasket that won't expand (picture side facing up).

Even carburetion can have its problems.

Bill Robertson
#5939

>--- In dmcnews@xxxxxxxxxxxxxxx, "Elvis" <elvisnocita@...> wrote:
>
> 
> Bill, I am impressed that you took your time
> to get this right. 
> 
> I don't want to go to deep into that boiling 
> gas problem, in am no expert in that. But I can 
> imagine it is a similar problem like having 
> air in the brake lines !
> To make it work right you need a system full of gas
> without air in it. 
> 
> A carubrator works different - whenever the carbs 
> need fuel the floating devices open the channel.
> air that is trapped in there is pushed out with no 
> counter pressure.
> 
> in our pressurized system you need at least 3Bar
> to open the valves. When we have the hot start problem, 
> swapping the connectors from WUR to the cold start valve
> solves it. why ? because this valve opens the electrically
> and not via high pressure. trapped gas (NOT Liquid) is 
> pushed out this way.
> 
> Just my theory, maybe it needs more details, but it 
> can't be too wrong.
> Again - I am really impressed that you thought of the
> RPM relay again. 
> 
> Elvis...stil in need of a Carfax account :-(



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