Question about Chevrolet C1500
THe way the fuel system on the 4.3 is like this The vehicle has a back up power supply for the fuel pump fuse # 9 powers the system 20 amp .This goes to the re lay but also splits and goes to the oil pressure sending unit on circuit 440 org wire . Then they reconnect past the oil pressure unit on a gray wire gray 1 and gray 2 and this wire feeds the power to the fuel pump . So even if the relay were bad the vehcile should still start it just takes more cranking time for the engine to build up enough pressure to trips the switch inside the sending unit If you have the orginal pump in the vehicle there wore problems with the wireing to the pump it wasn't restance wire and over heated causeing problems the new pumps have a differant connector on the pump and the wires need to be cut and spliced to correct the problem This sounds like a problem with the pump wireing eighter a bad gound for the pump motor or to much resistance on the feed wire . How dose the truck run when it is running do you get codes like mis fire codes dose it do OK going up hill under acceleration . I have the complete wireing schematic for this system if you need it i would have to E . MAIL it to you .You could also try this red wire under the hood thats called the fuel prime test connector its not pluged into anything on some vehicles its near the master cylinder and on others its near the blower motor for the heater fan if the relay is bad you can't check this but its a stright shot to the fuel pump motor check the resistance or you could do this off the gray feed wire curcuit 120 from the oil pressure sending unit . It has to be a ground problem or a resistance problem with the pump If you need the schematic let me know pier_j
Posted on Apr 01, 2011
Hi, several things can cause the fuel pump to fail. The fuel pump not being used for a long time would be one reason. Bad fuel or contaminated fuel would be another reason. If it is a electric fuel pump, then running the car out of fuel will damage a electric fuel pump. A dirty fuel filter will cause the fuel pump to work harder than it should and will cause it to wear out prematurely as well.
Posted on Apr 01, 2011
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Posted on Jan 02, 2017
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