replaced the engine and no gas is getting to the thottlebody
GMC Q&AAsk Your Question
1990 GMC 1500 Pickup Question: how to troubleshoot the fuel pump
Answer #1patrick mannion from Greg Solow's Engine Room, April 23, 2010, 22:17Master
There are 4 engine options this year each has slight differences in the wiring diagrams. They need an input from the oil pressure switch to turn on the fuel pump relay. The wiring diagram is easy to follow. There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try http://www.eautorepair.net/Marketing/Default.asp?VID=125669 and get an online repair manual subscription.