

| Subject: | Re: Digifant II quirky issue. 3000 RPM rev limit? |
| From: | Neil N |
| Date: | Thu, 11 May 2017 10:16:49 -0700 |
this is a LONG SHOT idea but most relays of this type have a diode or resistor or similar in parallel on switch side of relay. I REALLY doubt this comes into play here, but is polarity on switch side important in this application? If i recall, Vanagon relays typically use 85 for ground, 86 for positive. Image of a Vanagon relay showing part I refer to: https://goo.gl/photos/tzx1TGCW8TFCZ2J2A and image showing where intermittent fault happened at my FP relay (Jetta part) https://goo.gl/photos/YoANC3d3HgxAhphJ9 On 5/11/17, Chris S <szpejankowski@gmail.com> wrote: > When I bypassed the fuel pump relay it revs to the redline. Since the > problem started after I replaced the relay, we may have found the issue. I > will order another relay and cross fingers. > > Thanks, Alex! > > Chris > > Dnia 11.05.2017 o godz. 12:05 Alex Towner <alexandertowner@GMAIL.COM> > napisał(a): > >> I hope I'm not covering this again, since I get the list in digest form. >> >> My amateur garage would be removing the fuel pump relay and installing a >> jumper wire between terminals 87 and 30 (the perpendicular center ones). >> Keep in mind this will run the fuel pump from the second it is installed >> and should only be inserted when you are planning to run the engine. >> Remove >> it when the engine is off to prevent battery drain and flooding. >> >> By removing the relay and replacing with a jumper the relay is removed as >> a >> potential cause of your woes. >> >> It is possible for a VW fuel pump relay to limit RPM. Not sure how it >> works, but certain CIS injected Golfs and Foxes circa '85 - '87 had a FP >> relay that cut off the fun at 6000 RPM. You could have a defective one of >> those installed or some sort of industrial engine one perhaps? >> >> I think looking at the distributor next as you have been doing makes >> sense. >> >> Hope this helps. >> >> Alex > -- Neil n Blog: Vanagons, Westfalia, general <http://tubaneil.blogspot.ca> 1988 Westy Images <https://picasaweb.google.com/musomuso/New1988Westy> 1981 Westfalia "Jaco" Images, technical <http://tubaneil.googlepages.com/> Vanagon-Bus VAG Gas Engine Swap Group <http://tinyurl.com/khalbay>
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