1987 Chevy S-10 Excitement and Danger

[tashirosgt]

On a friends 1987 Chevy S-10 I am involved in the excitement and danger of trying to do a fuel pressure test. We have the gauge hooked up to the fuel line. Now the books say to jumper the positive battery terminal to a certain connector in order to run the fuel pump. But we can't find that connector. It is not the 'G' terminal of a connector in the cab, as on some models, since no wires on the harness are even connected to that terminal. It is not, as the Haynes books say, a " single wire connector near the fuel pump relay", which appears to be one of a pair of relays on the drivers fender wall of the engine compartment. There is no connector near them. This truck has the "throttle body injector" (TBI) type of fuel system, if that helps narrow the search.

[tashirosgt]

For all you 1987 Chevy S10 TBI owners, it is a single wire connector. The connector is black and the wire is white and tan. Near the distributor this wire and a red and a green one run up the firewall. So they are on the passenger side half of it. They are taped together in a few places. As a check that this was the correct connector we first determined which relay affected the fuel pump. Of the two on the bracket mounted on the drivers side fender wall, it is the one nearest the driver. If you disconnect the connector to that relay it has one row of 3 pins and a "row" of a single pin. The single pin is hot (12 V to ground) so be carefult not to touch it. The middle pin goes to a tan and white wire. Verify that there is zero volts to ground on this middle pin. Verify that there is zero volts to ground on the single wire connector with the white and tan wire. Then verify there is continuity between the middle pin and the single wire connector.