According to Simmons, Reid W:
>
> You should NOT have a substantial vacuum build up in the tank.
I think the problem here is a matter of how much. Which none of us can
actually express in Email. :-)
> This vacuum
> will fight the efforts of the fuel pump and lean out the mixture thus
> increasing the RPM,
I don't notice any effect like that and as I say I have run the tank down
to empty on at least one occaision. I also notice no difference in the
amount of WHOOSH when the tank is 3/4 full and when it is nearly empty.
I also have the same effect when I unscreww the cap from my much newer :-)
Jeep Grand Cherokee.
> and if it continues over a long period of time will
> collapse the fuel tank. I know I had this problem.
As I said, I notice no measurable flex in the sides of the tank.
> After I cleaned out the
> blocked restrictors in my fuel tank vent line I had no more vacuum build up.
> Cleaning out the restrictors is definintely a better solution than driving
> around with the fuel filler cap open.
With the better weather starting (I am considering taking the hardtop off
for the year this weekend!!) I will be able to start working on the car
somemore. I will check out all the pipes and valves and see if I can find
any obstruction but I still think some small negative pressure is a result
of the smog control junk on federal cars. It disipates quickly when the
car is not running and is noticed primarily when I race up to the pumps
and immediately pop the lid.
But all suggestions are appreciated and I can see where excessive vacuum
in the fuel tank could be a serious problem.
All the best.
bill
--
Bill Gunshannon | de-moc-ra-cy (di mok' ra see) n. Three wolves
bill@cs.uofs.edu | and a sheep voting on what's for dinner.
University of Scranton |
Scranton, Pennsylvania | #include <std.disclaimer.h>
|