Thank you Jan for your good advice! I'll lokk into the problem on Monday.
Ragards
Hans
----- Original Message -----
From: "Jan de Jong" <jan_de_jong@casema.nl>
Sent: Sunday, October 17, 2010 2:39 AM
Subject: Re: Europa-List: Too high fuel pressure
>
> From your description I would still suspect the return line. Is there a
> 1-way valve in there?
> A way to test it would be to connect the forward line (from the pumps)
> directly to the return line using a T-piece with the differential
> pressure measurement moved to between the 3rd leg of the T and the
> airbox. Run a pump, then both pumps, and see the lowest differential
> pressure the regulator can be expected to provide. If it is over 5 psi
> it is out of Rotax spec and the return line needs repair.
> It could be a very improvised connection - it should only have to deal
> with a gauge pressure of 5 psi.
> On the other hand, with a completely closed return line a pump delivers
> 1.8 bar (26 psi). And both in series 3.6 bar (53 psi).
> In that case you can make it a very short test.
> At zero pressure the pumps are rated to supply 120 l/h. I have heard
> that the pumps tend to get better with use. Maybe the improvement to
> your current 160 l/h is making it apparent that the return line is too
> restrictive.
>
> Regards,
> Jan de Jong
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