Skip to main content
Gerry | Vanagon
Checking account...
← vanagon.com home · Continue the discussion in the forum
Subject:Re: Digifant II quirky issue. 3000 RPM rev limit?
From:Chris S
Date:Thu, 11 May 2017 13:05:25 -0400

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