Date: Sat, 1 Feb 2003 00:29:56 -0500
Reply-To: Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject: Re: diesel-gas conversion problems solved! (mostly)
In-Reply-To: <069901c2c9ab$bac72880$bc0e4ed8@volksfix>
Content-type: text/plain; charset=us-ascii
Your right. The Vanagon fuel pump is a positive displacement pump so it
will continue to build pressure until relieved or the motor stalls out,
and then burns up. Another possibility is that at high speed/load the
pump may not keep up with demand causing the engine to lean out. Good
bye valves and pistons or at least a lack of full power potential. The
check valve and accumulator is an extremely important part of the CIS
system. Since this system is all hydraulic, if it gets air-bound after
the fuel distributor, the engine can be hard to start. Fuel pressure
must be maintained after shut down so that the fuel does not vaporize in
the lines causing that vapor lock.
Dennis
-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@GERRY.VANAGON.COM] On Behalf
Of Open Wheel Racing
Sent: Friday, January 31, 2003 11:38 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: diesel-gas conversion problems solved! (mostly)
Hi Dennis,
Its also been my experience that the Vanagon pumps don't put out
enough
pressure. I think I have the answer as to why some folks are getting
them to
work on CIS systems. In the multiport Vanagon format, the fuel pressure
regulator relieves the pressure quickly enough to keep the operating
pressure at or about 30 to 40 lb's of available pressure, which works
well
with the electric injectors. But not enough to open the manual CIS's
injectors. So here are my thoughts on why it works somewhat. With the
mechanical control pressure regulator, and fuel distributor design, the
low
pressure Vanagon pump is dead-heading so to speak, and builds up enough
pressure to open the CIS injectors.............. It is most likely very
hard
on the pump, and should shorten its life greatly. I would spend the
money
and get da right sh t! I meant I would not presume to out wit those
dummies
at Bosch!
I also agree on the use of an accumulator, and metal fuel lines,
pressure and relief.
Howard
> The Vanagon fuel pump is designed to run at less than 40 psi. CIS
> requires a pump that can deliver at 80 psi, has a check valve, and you
> will also need a fuel accumulator. You also need to replace the hoses
> with reinforced lines or steel tubes designed for that pressure.
>
> Dennis
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