Hose In Hose

From WVO Designs Wiki

Many conversions in northern climates benefit from HIH. While initially appearing quite complicated and leak prone they are actually quite inexpensive and safe.

The following design uses 3/8" aluminum fuel line and 3/4" heater hose with a 5/8" heater hose connection in the vehicle system.

Parts list:

ITEM DESCRIPTION	QTY
3/8" Compression x 1/2" NPTF Male Pipe (Brass)	2
1/2" NPTF Female Pipe Tee (Brass)	2
Brass Hose Barb, 3/4" Hose x 1/2" NPTF Male	2
Brass Hose Barb, 5/8" Hose x 1/2" NPTF Male	2
3/4" Coolant/Heater Hose	As Req
3/8" Aluminum Fuel Line	As Req

The aluminum fuel line would seal at the compression fitting, but instead of ending would continue through the pipe tee and concentric with the 3/4" coolant line. Two of these fittings would be require to complete the hose in hose design.