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Heated Filter Designs
Extracted Dialogs from vegoil-diesel
Date: Tue, 29 Mar 2005 19:46:16 +0800
From: "warfa" <email@example.com>
Subject: Re: Digest Number 1103
You have already been given advice on the issue of tank heating and the use of coolant, rather than exhaust gas for the heat source. I would advise that it would be preferable to have the heat exchanger tubing welded to the underside of the fuel tank, to avoid any chance of fuel contamination with coolant should an unforseen leak occur. With any external fuel tank, insulation shoulkd be installed if operating at low temperatures.
Please ensure that you prefilter the "solid grease" to 5 micron or better before filling your vegoil tank. I use this method and have not yet needed to replace a fuel filter on my MB300D in 12,000km since conversion. Filtering near the tank is an excellent location, provided that the filter is heated, and a fuel pump is added between the tank and filter. A heated fuel line should be used to deliver the vegoil to the fuel selection valve near to the IP inlet. It may be necessary to install an insulated box to house the pump and filter, to prevent excessive heat loss from these items.
For operator peace of mind, I always recommend using separate fuel pump, filter and fuel lines for the vegoil system, as you can then return to the stock system if a problem occurs. This is especially important if the converted vehicle is your main source of income, or if isolation is a factor.
Are you planning on a looped return line when running on vegoil? It has come to my notice that this choice may defeat a pressure relief valve in some IPs. This could cause IP seal failure due to excessive fuel pressure. The IP which has been advised to me, with this relief valve, is the Bosch IP as fitted to the MB 300D (240D has a similar system). Looping the return may also pressurise the inter injector return lines, which may not be able to take lift pump pressures - long term. I had a Injector return line pop off due to pressure, spraying vegoil all over my hood pad. - not pretty. :(
Tony From West Oz