With guaranteed fit, and function The GB Fuel Injection Spider Assemblies are 100 percent tested to meet or exceed OEM specifications; New Assemblies may Provide cleaner emissions, better fuel economy and performance, and improved reliability.

These are also called a Vortec Spider Assemblies.

Warranty: GB's 12-month or 15,000-mile warranty

GM vortec V6 and V8 Spider Assembly Diagnostics

In the case of GM Vortec central point injection or CPI engines, the fuel pump is sometimes misdiagnosed as the cause of fuel system failure. A low pressure/no start situation is not necessarily caused by your fuel pump.

A Key On/Engine Off pressure drop could potentially signal a failing CPI unit. There is a pressure regulator inside the CPI spider assembly is notorious for failures on Fuel Injection Spider Assemblies. Often the regulator diaphragm fails and the plenum fills with fuel and the engine will flood out with gas.

The small valve the end of the tubes require full system operating pressure to open. System operating pressures are 55-61 PSI for 1995 and older vehicles and 60-66 PSI for 1996 and newer.

Find your the CPI unit to determine if a no start condition is caused by a faulty CPI unit or the fuel pump. To rule out the fuel pump and check valve, disconnect your fuel supply line from the fuel filter, Connect a fuel pressure gauge to the fuel line coming from the pump, and power your fuel pump just long enough to achieve at least the operating pressure.

Another common failure with the CPI Fuel Injection Spider Assemblies is leaky tubes and CPI Valves stuck closed.

If you have Leaking Spider tubes will cause engine-off fuel pressure to slowly drop, creating hard starts. A Poppet Valve stuck closed will create an engine misfire from fuel starvation.

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