Does this kit cover from tank to engine connection?

Sort of. This kit will get you from the engine to the front of the tank, behind the fuel cooler, where the factory quick disconnects are. The 2 flexible lines that come directly off the tank are not included.

What size is the return line on 08 chevy Silverado 2500hd duramax 6.6 lmm

They are the same size as the stock lines originally from factory..

Will these fit an extended cab long bed duramax?

Check the Dorman website. This is how I verified my truck fitment. Mine was a 4 door, 8ft bed, dually, 4x4, deisel

Dorman 919-874 Front Fuel Line for Select Chevrolet / GMC Models (OE FIX)

Product ID: 473965228

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Details

Brand
Dorman
Color
Black
Global Trade Identification Number
Item Length
3.75 Feet
Item Weight
0.01 Ounces
Manufacturer
Dorman

Specifications

ASIN	B07DXG6Y7Z
Best Sellers Rank	#397,869 in Automotive ( See Top 100 in Automotive ) #233 in Automotive Replacement Fuel Lines
Brand Name	Dorman
Color	Black
Customer Reviews	3.9 3.9 out of 5 stars (128)
Global Trade Identification Number	00885484819153
Included Components	3 Fuel Line Sections
Item Length	3.75 Feet
Item Type Name	Front Fuel Line for Select Chevrolet / GMC Models (OE FIX)
Item Weight	0.01 Ounces
Manufacturer	Dorman Products
Manufacturer Warranty Description	Limited Liftetime
Material Type	Stainless,Stainless Steel,Steel
Nominal Wall Thickness	0.020 inches
Outside Diameter	0.5 Inches
UPC	885484819153
Unit Count	1.0 Count

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Dorman 919-874 Front Fuel Line for Select Chevrolet / GMC Models (OE FIX)

Details

Description

Specifications

Common Questions