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Bob, Auto Tech
Category: Chevy
Satisfied Customers: 4087
Experience:  Plus 40 years GM, over 30 certified with Chevrolet, ASE certified Master Tech. (Expired, Retired)
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Where is the fuse for a 1993 Chevy Astro Van, if there is one

Resolved Question:

Where is the fuse for a 1993 Chevy Astro Van, if there is one? The owner's manual does not show one. I cannot get electric to the fuel pump.
Submitted: 7 years ago.
Category: Chevy
Expert:  Bob replied 7 years ago.
The fuses to check that supply power to the fuel pump are ECM 1, fuse - a red 10 amp in the fuse box. Powers the injectors and control module. Also check the fuse that says ECM B, it powers the fuel pump, fuel relay and oil pressure switch. Also in the fuse box, also a red 10 amp. Understand that when you turn the key on, the fuel pump will only have power for about 2 seconds or so. This is normal. Then when you start cranking on the starter, the pump should get voltage again, any time the starter is engaged. Once the motor starts, the oil pressure switch that makes the oil gage work, also takes over the circuit for the fuel pump and supplies power to the fuel pump. So, in effect there are 3 different ways the pump gets power. Also note that the fact that the pump works off of the truck does not prove very much. This system needs to have between 55 & 61 psi fuel pump pressure in order for the fuel injectors to open. That is a lot of pressure and the only way to check it is with a fuel pressure gage. The test port looks like a tire fill valve and is located on the fuel injection rail. Also be sure you are getting power to and from the fuel pump relay. Do your testing for power at the wiring harness that goes to the top of the fuel tank, the power wire will be the gray one. The purple is for the gas gage and the other (black) is for the ground. Be sure you also have a good ground to the system. Let me know what you find. Thanks
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