Name: GMC TopKick Auxiliary Fuel Line Set 2004 C4500/5500 w/Auxiliary Tank RPO Code NG6 8.1L Gas FL688-B2I
Brand: Lines - To - Go
SKU: FL688-B2I
Price: 294.95 USD
Availability: InStock

Year Make & Model

GMC TopKick Auxiliary Fuel Line Set 2004 C4500/5500 w/Auxiliary Tank RPO Code NG6 8.1L Gas FL688-B2I

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Shop LinesToGo for 2004 GMC TopKick truck fuel lines - C4500/5500 w/ Auxiliary Tank Only RPO Code NG6, 8.1L Gas engines.

SKU: FL688-B2I

Weight: 3
Installation Instructions

Box Dimensions 51" x 6" x 4"

How to use a Quick Disconnect Tool

Front Fuel Tank Connections to Rear Fuel Tank Connections

1 supply line 3/8" (in 2 sections), 1 return line 5/16", hoses to front fuel tank, hoses to rear fuel tank

88944212, 25786996, 25896056, 25896055

Lines are constructed from Galfan® coated tubing for rust protection with original equipment end forms and fittings and are CNC (Computer Numerically Controlled) bent for an easy precise installation.

All hoses are made from Stainless Steel Braided Teflon with OE style fittings

Need Assistance? Call us toll free 1-855-781-5992

We'll make sure you're ordering the correct part and we can take your order for you too.

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Quick Disconnect Tools, Plastic 3/8" & 5/16" 3133-01

Save $2.50

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Quick Disconnect Tool, Steel 3/8" & 5/16" 5230-01

Save $3.12

05/25/25

William S.

09/29/24

Great

The team was great to work with.They made sure that I had the right part.The parts were great and fit perfect. Good quality.I would definitely order from them again. Delivery was next day.

On LinesToGo.com

Matt R.

05/16/25

Top notch product!

Recently purchased at set of fuel lines for my 1992 f350 7. 3L . Amazing quality ! I'm super thrilled with the service. Can't ask for much more.

Ted E.

07/12/24

Perfect fit fuel lines 02 Avalanche 2500 !

I bought the complete set of fuel lines for a 02 Avalanche 2500. All high quality OEM style product. It took longer to remove old lines than to install new ones. Remember to install new fuel pumps and filters during installation. Great Canadian company where I will buy all my lines from.

keaan l.

Effortless service.

Ralph V.

05/23/25

Quick delivery. As described, worked

Quick delivery. As described, worked great.

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GMC TopKick Auxiliary Fuel Line Set 2004 C4500/5500 w/Auxiliary Tank RPO Code NG6 8.1L Gas FL688-B2I

Auxiliary Tank Only RPO Code NG6 L18

GMC TopKick Auxiliary Fuel Line Set 2004 C4500/5500 w/Auxiliary Tank RPO Code NG6 8.1L Gas FL688-B2I

Auxiliary Tank Only RPO Code NG6 L18

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GMC TopKick Auxiliary Fuel Line Set 2004 C4500/5500 w/Auxiliary Tank RPO Code NG6 8.1L Gas FL688-B2I

Auxiliary Tank Only RPO Code NG6 L18

GMC TopKick Auxiliary Fuel Line Set 2004 C4500/5500 w/Auxiliary Tank RPO Code NG6 8.1L Gas FL688-B2I

Auxiliary Tank Only RPO Code NG6 L18

Delivery Time & Rates

Overview

Video Instructions

Location

What's Included

OEM Part Numbers

Tube Construction

Hose Construction

Complete The Job With

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