Sylvie Willis
The 1956 Chevy was a popular car, but its assembly manuals are not always clear. This is particularly true when it comes to fuel lines, which can be run on the inside or outside of the frame, depending on the engine. The fuel line diameter is an important specification, as it determines the amount of fuel that can flow to the engine.
| Characteristics | Values |
|---|---|
| Fuel line diameter | 3/8 line |
| Fuel line part number for wagon/sedan delivery | 3728156 |
| Fuel line part number for regular passenger car | 3728155 |
| Fuel line diameter for cars with 6-cyl or 2bbl V8 | 5/16 |
| Fuel line diameter for cars with 4bbl V8 | 5/16 |
| Fuel line diameter for cars with dual 4bbls and 57 fuel injection | 3/8 |
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What You'll Learn
- Cars with a 6-cyl or 2bbl V8 engine have a 5/16 fuel line
- Cars with a 4bbl V8 engine have a 5/16 fuel line
- Cars with a 4bbl V8 engine have their fuel line run on the outside of the frame
- Cars with a 4bbl V8 engine have their fuel line run on the inside of the frame
- Cars with a single 4bbl, 2 4bbl and FI (57) used a 3/8 fuel line
Cars with a 6-cyl or 2bbl V8 engine have a 5/16 fuel line
Cars with a 4bbl V8 engine also have a 5/16 fuel line, but these are run on the outside of the frame, along with the brake lines. This is to prevent vapour lock from the dual exhaust.
All 1956 and 1957 models equipped with dual 4bbls and 1957 fuel injection cars used a 3/8 fuel line, which was run outside the frame, along with the brake lines.
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Cars with a 4bbl V8 engine have a 5/16 fuel line
The 1956 Chevy had a 5/16 fuel line. This was also the case for the 1955 and 1957 models. However, all 1956 and 1957 models equipped with dual 4bbls and 1957 fuel injection cars used a 3/8 fuel line. This was run outside the frame along with the brake lines.
The 5/16 fuel line is also found in other cars, such as the Chevy Nova, which has a factory 5/16 fuel line. The 5/16 fuel line is good for up to around 300/320hp in the average vehicle with a rear-mount tank and all the twists and bends associated with that.
The 5/16 fuel line is also found in a '71 Chevelle that came factory with a 350 2bbl. To measure the fuel line, you can take an open-end wrench and try to slide the open end over the tube.
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Cars with a 4bbl V8 engine have their fuel line run on the outside of the frame
The 1956 Chevy 150 2 Door Sedan, for example, has a 5/16 fuel line that runs on the outside of the frame. This is the same for all 56 & 57 models equipped with dual 4bbls & 57 fuel injection cars, which use a 3/8 fuel line.
The 1956 Chevy 150 2 Door Sedan is a "power pack" car with factory dual exhausts. This means that the fuel line runs on the outside of the RT frame rail.
When installing a fuel line, there are a few things to consider. If you are using a steel tube line, it is recommended to run it outside the frame. If you are using a flexible hose, you can run it inside the frame. It is also important to consider the firewall, which must provide a bulkhead between the engine and/or fuel tank and driver compartment. All holes in the firewall must be sealed with aluminium or steel.
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Cars with a 4bbl V8 engine have their fuel line run on the inside of the frame
Cars with a 4bbl V8 engine have their fuel line run on the outside of the frame. This is to prevent vapour lock from the dual exhaust. The fuel line diameter for these cars is 5/16.
However, this does not apply to all 1956 Chevys. The 1956 Chevy 150 2 Door Sedan, for example, has a single 4bbl engine and uses a 3/8 fuel line. This is also the case for the 1963 Corvette Roadster and the 2006 Corvette Roadster.
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Cars with a single 4bbl, 2 4bbl and FI (57) used a 3/8 fuel line
The 3/8 fuel line was run on the outside of the frame along with the brake lines. This was to prevent vapour lock from the dual exhaust.
The single 4bbl option is also referred to as RPO 410. The fuel line part number for the wagon/sedan delivery is 3728156, and for the regular passenger car, it is 3728155.
The 1956 Chevy 150 2 Door Sedan is an example of a car with a single 4bbl.
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Frequently asked questions
The fuel line diameter depends on the type of car. Cars with a 6-cyl or 2bbl V8 used a 5/16 fuel line, while cars with a 4bbl V8 used a 3/8 fuel line.
A 6-cyl engine has six cylinders, while a 2bbl V8 engine has eight cylinders.
The fuel line delivers fuel from the tank to the engine.
The fuel line is located on the outside of the RT frame rail for cars with dual exhausts. For other cars, the fuel line runs on the inside of the frame.
