Tbi Fuel Pump Wiring Diagram

Fuel pump wiring for 1989 chevy truck duration.

Tbi fuel pump wiring diagram. A typical tbi pump pressure must be able to maintain 15 to 18 psi. 1993 4 3l 5 0l and 5 7l gmc chevrolet pickups with the 4l60 e automatic transmission for the 1994 fuel pump wiring diagram check out the following article. How to diagnose bad fuel pump. A2 not used a3 not used a4 gry to egr relay optional this is a ground from the ecm to control the egr relay.

Here s a list of the pins but they are also on the wiring diagrams above. Wiring repair 14 special tools 15 vehicle section r v models a 1 p chassis b 1 wiring diagrams 2 description figure 1 wire coding the diagrams are to be traced from the source of electricity the battery positive post to ground. The ground may be a chassis ground on a certain com ponent such as an alternator or a starter or a wire. 1987 1994 chevy gmc tbi engines.

A5 brn wht ses service eng soon light. 1994 fuel pump circuit tests gm 4 3l 5 0l 5 7l. Fuel pump relay wiring diagram automatic transmission only note. Fuel pressure is critical to the operation of a fuel injection system.

A1 grn wht this wire is used to energize the fuel pump relay. Papa ragan 17 571 views. Always check to insure that you have the proper fuel pressure. Fuel injection sucks 657 738 views.

The gray wire labeled fuel pump feed must be connected to the positive fuel pump power wire to energize the fuel pump. One of the most popular efi conversions to older chevy engines or any engine for that matter is the gm tbi system using the 1227747 ecm. Fuel pump the ecm sends a signal to the fuel pump relay to turn on the fuel pump. Higher pressure than 15 psi indicates that there is an issue with the installation.

Rebuilding and modifying a gm tbi fuel injection unit duration. There are many others that will do the same thing but the 1227747 is most well known and documented and will be the basis for this article. This is a ground to turn on the light.