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<div dir="ltr" data-setdir="false">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.<br></div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Tony<br></div><div><br></div>
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On Friday, September 10, 2021, 03:22:02 AM CDT, David Hall <dave@hallvw.clara.co.uk> wrote:
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<div><div dir="ltr">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. <br clear="none">Dave Hall<br clear="none">UK VW Type 3 and 4 Club<br clear="none"><br clear="none">> On 10 Sep 2021, at 04:53, <a shape="rect" href="mailto:jadney@vwtype3.org" rel="nofollow" target="_blank">jadney@vwtype3.org</a> wrote:<br clear="none">> <br clear="none">> On 10 Sep 2021 at 0:41, Tony Rongey wrote:<br clear="none">> <br clear="none">>> I'm kind of wondering about the fuel delivery. The coil is also suspect,<br clear="none">>> because it was pretty hot after running. It's blue coil which seems to be a<br clear="none">>> hit or miss kind of thing. I have an old black Bosch that I'll try this<br clear="none">>> weekend, but it's untested so it might not help.<br clear="none">> <br clear="none">> The OE Bosch black coils have been incredibly reliable. The Bosch Blue Coils, not so much, <br clear="none">> although I've always assumed that the German ones must have been good.<br clear="none">> <br clear="none">> I'm thinking fuel delivery, too. If you don't have a low pressure gauge, it should be possible <br clear="none">> to make a manometer with a branch in the line from the pump to the carbs. If the branch is <br clear="none">> clear plastic, you can measure the vertical height that the pressure can push the gas up the <br clear="none">> tube.<br clear="none">> <br clear="none">> A very quick & dirty calculation predicts that 3.5 psi should push gasoline up about 5.2 feet. <br clear="none">> It will go proportionally higher if the pressure is more than 3.5. This will not be easy to do, so <br clear="none">> it's probably easier to find a cheap gauge. My gauge for this would be a cheap J C Whitney <br clear="none">> gas pressure/manifold vacuum gauge.<br clear="none">> <br clear="none">> If you measure the pressure, either way, don't worry about the actual number. The point will <br clear="none">> be to compare the pressure that you have when running well with the pressure when the <br clear="none">> engine gets weak. They should be the same. If they're not, you've probably found your <br clear="none">> problem.<br clear="none">> <br clear="none">> -- <br clear="none">> *******************************<br clear="none">> Jim Adney, <a shape="rect" href="mailto:jadney@vwtype3.org" rel="nofollow" target="_blank">jadney@vwtype3.org</a><br clear="none">> Madison, Wisconsin, USA<br clear="none">> *******************************<br clear="none">> <br clear="none">> _______________________________________________<br clear="none">> VWType3.Org mailing list - <a shape="rect" href="mailto:type3@vwtype3.org" rel="nofollow" target="_blank">type3@vwtype3.org</a><br clear="none">> To unsubscribe or change subscription options, visit:<br clear="none">> <a shape="rect" href="http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org" rel="nofollow" target="_blank">http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org</a><br clear="none">> If you need more help, contact: <a shape="rect" href="mailto:gregm@vwtype3.org" rel="nofollow" target="_blank">gregm@vwtype3.org</a><div class="ydp35c7ff12yqt4670342229" id="ydp35c7ff12yqtfd08797"><br clear="none">_______________________________________________<br clear="none">VWType3.Org mailing list - <a shape="rect" href="mailto:type3@vwtype3.org" rel="nofollow" target="_blank">type3@vwtype3.org</a><br clear="none">To unsubscribe or change subscription options, visit:<br clear="none"><a shape="rect" href="http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org" rel="nofollow" target="_blank">http://lists.vwtype3.org/listinfo.cgi/type3-vwtype3.org</a><br clear="none">If you need more help, contact: <a shape="rect" href="mailto:gregm@vwtype3.org" rel="nofollow" target="_blank">gregm@vwtype3.org</a><br clear="none"></div></div></div>
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