<html><head></head><body><div class="ydp6de1b699yahoo-style-wrap" style="font-family:times new roman, new york, times, serif;font-size:16px;"><div><div><span><div dir="ltr">Car is a '71. Did I say '73? I'm pretty sure I have ignition switches from past cars ('72 and '73) in my collection...if necessary. Whole steering columns, actually. But, which ones are compatible with a '71?</div></span></div><div><span></span> I also have some pressure sensors. Could a problem be with that?</div><div><br></div><div>And, there's still the smell of gas in the car...with no leaks visible. Would a bad spark plug...not igniting the gas spray from injector...cause that?<br></div><div> <br></div><div><span><div dir="ltr"><br></div><div dir="ltr">Subject: Re: [T3] Fuel Primer Switch.....</div></span></div></div><span><div dir="ltr">Message-ID: <<a href="mailto:5BAA3AE0.20841.2BA0D6A@jadney.vwtype3.org" rel="nofollow" target="_blank">5BAA3AE0.20841.2BA0D6A@jadney.vwtype3.org</a>><br></div><div dir="ltr">Content-Type: text/plain; charset=US-ASCII<br></div><div dir="ltr"><br></div><div dir="ltr">On 25 Sep 2018 at 5:33, J. Jonik wrote:<br></div><div dir="ltr"><br></div><div dir="ltr">> Why doesn't turning on the key multiple times, not to point of ignition, prime<br></div><div dir="ltr">> the fuel system?<br></div><div dir="ltr"><br></div><div dir="ltr">Turning the key multiple times clearly works, but it adds wear to the <br></div><div dir="ltr">ignition switch. That's not as much of a problem on your '73 as it <br></div><div dir="ltr">would be on a '71, where a replacement switch is almost impossible to <br></div><div dir="ltr">find, but even replacing a '73 switch is much more work and more <br></div><div dir="ltr">expensive than a primer switch.<br></div><div dir="ltr"><br></div><div dir="ltr">I think it's also likely that having a switch that allows you to run <br></div><div dir="ltr">the pump continuously, as opposed to a series of 1 second pulses, is <br></div><div dir="ltr">more effective in clearing the air out of the fuel system.<br></div><div dir="ltr"><br></div><div dir="ltr">> Then, what's wrong that it NEEDS special priming tricks, or primer<br></div><div dir="ltr">> switches?Is there an old, worn out, or dirty Primer Switch somewhere that ought<br></div><div dir="ltr">> be replaced, or cleaned?<br></div><div dir="ltr"><br></div><div dir="ltr">That's the $64k question. I don't know. I've worried about that for <br></div><div dir="ltr">decades and tried replacing everything in the system without <br></div><div dir="ltr">discovering the key.<br></div><div dir="ltr"><br></div><div dir="ltr">The ONLY remaining suspect I have is the fact that when these systems <br></div><div dir="ltr">were new, all the fuel lines in the engine compartment had grey vinyl <br></div><div dir="ltr">covers over the gas lines. It's possible that this gave just enough <br></div><div dir="ltr">extra heat shielding that the heating/boiling problem didn't occur. <br></div><div dir="ltr"><br></div><div dir="ltr">Over time, as we replaced those hoses, those sheaths were discarded, <br></div><div dir="ltr">because they were too hard to get over the new lines. Plus, most of <br></div><div dir="ltr">the time the new lines were larger than the OE so it would have been <br></div><div dir="ltr">impossible to slide the sheaths on.<br></div><div dir="ltr"><br></div><div dir="ltr">It's also possible that this problem always occurred in our hotter <br></div><div dir="ltr">climates, and that it has gotten worse with global warming (yes, it's <br></div><div dir="ltr">real) and possible changes in the vapor pressure of modern gasolines.<br></div><div dir="ltr"><br></div><div dir="ltr">I designed the primer switch kits to solve this very common problem <br></div><div dir="ltr">simply and cheaply. They're effective and cheap. They work.<br></div><div dir="ltr"><br></div><div dir="ltr">-- <br></div><div dir="ltr">*******************************<br></div><div dir="ltr">Jim Adney, <a href="mailto:jadney@vwtype3.org" rel="nofollow" target="_blank">jadney@vwtype3.org</a><br></div>Madison, Wisconsin, USA</span></div></body></html>