You’ll find there are two different spider injector systems:

Vortec spider injector testing. 62 psi and new fuel pump and strainer as well as a new external. The upper and lower intake are. Alright, here are the steps:

Refer to testing for intermittent and bad connections in the charts. Has correct fuel pressure when running a fuel pressure test. Connect your fuel pressure gauge to the schrader valve (see photo above).

Here is a grate video on testing your fuel system. 4.3l vortec mfi spider injector system w/ fuel return. Diagnostic chart (part 1 of 2) diagnostic chart.

Although this case study is about a 1995 4.3l gmc jimmy, the info and tests in this article apply to all of the ‘spider’ injector types on the road, whether it's a 6 or an 8 cylinder. Turbocharger and fuel injector sales and service. Symptoms of a stuck open ‘spider’ fuel injector.

Before you do, place rags under and around the schrader valve (as a safety. Gm spider injection replacement 33,969 views mar 26, 2020 how to replace the spider fuel injection system on a vortec gm engine. 1994 chevy s10 blazer 4.3 vortec no pulse at fuel injector no start.

The most common proble with the vortec engineis the spider assembly under the plastic intake plenem. About 1/2 way through, he tells you how to jump the relay pins in the fuse box, to make the fuel pump run without the relay plugged. Although it may s.eem impossible to test a leaking ‘spider’ fuel injector system or a leaky fuel pressure valve since both are situated within the intake manifold’s chamber, it is.