[T3] Loses Power After Running
trongey at yahoo.com
Fri Sep 10 07:00:12 PDT 2021
Hmm, good thought. It has the vent hose in place, but there's no guarantee that it's not clogged. That would also fit with the slow up and down pattern.
On Friday, September 10, 2021, 03:22:02 AM CDT, David Hall <dave at hallvw.clara.co.uk> wrote:
There have been fuel starvation problems when the fuel tank cap is a non breathing type, causing a partial vacuum to develop in the tank. Try loosening the cap next time it happens to check it’s not that.
UK VW Type 3 and 4 Club
> On 10 Sep 2021, at 04:53, jadney at vwtype3.org wrote:
> On 10 Sep 2021 at 0:41, Tony Rongey wrote:
>> I'm kind of wondering about the fuel delivery. The coil is also suspect,
>> because it was pretty hot after running. It's blue coil which seems to be a
>> hit or miss kind of thing. I have an old black Bosch that I'll try this
>> weekend, but it's untested so it might not help.
> The OE Bosch black coils have been incredibly reliable. The Bosch Blue Coils, not so much,
> although I've always assumed that the German ones must have been good.
> I'm thinking fuel delivery, too. If you don't have a low pressure gauge, it should be possible
> to make a manometer with a branch in the line from the pump to the carbs. If the branch is
> clear plastic, you can measure the vertical height that the pressure can push the gas up the
> A very quick & dirty calculation predicts that 3.5 psi should push gasoline up about 5.2 feet.
> It will go proportionally higher if the pressure is more than 3.5. This will not be easy to do, so
> it's probably easier to find a cheap gauge. My gauge for this would be a cheap J C Whitney
> gas pressure/manifold vacuum gauge.
> If you measure the pressure, either way, don't worry about the actual number. The point will
> be to compare the pressure that you have when running well with the pressure when the
> engine gets weak. They should be the same. If they're not, you've probably found your
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
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