I have a two-tank greascar kit, and I'm thinking of adding some insulation to my fuel lines, including the one that is sheathed by the coolant line and runs to the trunk, and maybe also my heated filter. What kinds of materials have people used to wrap around fuel lines/water hoses/veggie filters to help keep the heat in?

__________________
1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine

The GC kit is already pretty well insulated at the filter with the copper heating coil. The lines coming from the trunk are rubber and are NOT very good conductors of heat. There is heat loss, but not like a metal pipe. You could use a foam material (that's what I replaced on my AC pipes) or generally something that conducts heat less that the rubber hoses.

I also see that you're in Austin, TX. I know it's not hot year round there, but it's not Minnesota either. Might be overkill for your region.

__________________
1982 300TD 210K miles ("The Replacement" aka "The Anvil") - SOLD
1979 300SD 245K miles (never ending project)
2007 Pinarello F3:13
1995 Ducati 916 (SOLD, sniff)
1999 Ducati 900SSie (SOLD)

Agreed. Hose in hose provides ample heat without having to put additional insulation on the lines. You should be more than fine.

I insulate the front lines under the hood with simple 1/4 inch pipe insulation. I dont worry about the heater hose, but the little fuel hoses can get cold at 80 on the highway. That said, I live in Boston. I only do it for the winter. If 40F plus, no need IMO.

You can buy lengths of foam pipe insulation at the hardware store. They are dark grey in color and are usually about 6ft in length. They are manufactured for many different small diameter pipes, but measured in pipe.. so 2.5" pipe does not necessarily mean 2.5 inches. Take a 'sample' of your hose bundle to the hardware store and fit it there. They are cheap.. like $5 for a section. I used some spray-foam insulation in a can to insulate one of my switchover valves, I used a high-heat resistant torch-cutting drop cloth and some silicone tape to insulate my electric heaters on my injector lines.... you can make good insulation for heated filters and heat exchangers (flat plate or otherwise) from those cheapo foam wal-mart 3/8 or 1/2" thick camping matresses. Gorilla glue works for gluing that stuff together, zip ties are god

Thanks for the tips! I'm with you re: zipties - they have replaced duct tape as the solution for all problems!

__________________
1987 Mercedes 300D ~200K (Greasecar & Biodiesel)
1993 Ford F-250 7.3 IDI diesel 165K (Biodiesel)
1996 Thomas/International Bus with DT466 engine