Vegetable Oil SVO WVO waste cooking oil as biofuel

[Cumminscanuck]

I notice that when I switch over to VO my fuel pressure momentarly drops from 15 psi on the diesel pump to zero and then picks back up to 16 psi on the VO pump. Having a VP 44 IP this is a little worrying so I thought I would put a check valve in the fuel line to prevent flow back which will hopefully, cure the problem. Has anyone done this and if so, where is the best spot to place the valve?

[Welder]

Are you running Veggiestroke style plumbing?

If so, then yes, you may likely need a couple one-way check valves.

McMaster-Carr sells some fairly cheaply:

www.mcmaster.com

[Cumminscanuck]

I'm not sure I know what "Veggiestroke" type plumbing is, what is it? My VO line exits the Hotfox in the tank then goes through a FASS HPFP pump to a Vegmax heated filter then through a Vegtherm and FPHE (thanks Klaus) to the Hydraforce Valve that switches diesel/VO. Changing from VO to diesel does not cause a drop in pressure of any significance presumably because the diesel system is maintaining pressure. The VO system does not appear to be acting the same way; the fuel pressure drops considerably on switchover then recovers.