This is about my '96 Tahoe LT 2 Dr. 4WD 5.7L (350 c.i.) with 134k miles. I drove the truck about 75 miles during which it was running great w/ all gauges reading normal. I had 1/4 tank of gas. After parking the truck for about 2 hours I then went to start it for the drive toward home. It cranked and cranked but no start. No codes either. This happened once before last summer when a new fuel pump relay fixed the problem. So after bumming a ride to the auto parts house, I did a field install of a new relay while in the parking lot where I was stranded. Still NO START. Cranking sounded normal and strong. Then had it hauled via flatbed tow to the Chevy dealer near home. They said the truck needed a new fuel pump and fuel tank sending unit (sending unit was needed due to rusted fuel supply and return tubes that would likely break off when removed...which they did. The I.D. of the lines was like new with only exterior rust).
The Chevy dealer's estimate was really heavy @ $1,450 so I hauled the truck home. Bought all genuine GM & AC-Delco parts and did the replacement. Also went for a new fuel tank while I was at it. Before putting the tank back in the truck, and with the truck up on heavy duty jackstands, I put my multimeter on the gray wire connector pin which powers the fuel pump. This connector is on the rear frame crossmember directly above the front of the fuel tank. My wife got in the truck (yup, I trust her) and cranked it over a few times so I could check the power supply to the fuel pump. NO POWER to the fuel pump. The battery connections are good. Note that I did have the battery ground disconnected during the pump & sending unit removal/replacement....this was reconnected for the power supply to the pump test described above. I did put my multimeter ground lead in a few different places on the frame to eliminate bad ground to the meter as an issue. All fuses in the fuse/relay box under the hood are good and I tried the fuel pump power supply check procedure with two different fuel pump relays plugged in.
I have the GM vehicle specific service manual (both volumes) and checked the schematic for the fuel pump circuit. Nothing jumped out at me as the next thing to check. Suppose I could check the gray wire continuity from the fuse/relay block back to the connector pin.
Would greatly appreciate any other recommendations on what to check next or solutions found by other members with similar truck issues in the past.
Thanks!
The Chevy dealer's estimate was really heavy @ $1,450 so I hauled the truck home. Bought all genuine GM & AC-Delco parts and did the replacement. Also went for a new fuel tank while I was at it. Before putting the tank back in the truck, and with the truck up on heavy duty jackstands, I put my multimeter on the gray wire connector pin which powers the fuel pump. This connector is on the rear frame crossmember directly above the front of the fuel tank. My wife got in the truck (yup, I trust her) and cranked it over a few times so I could check the power supply to the fuel pump. NO POWER to the fuel pump. The battery connections are good. Note that I did have the battery ground disconnected during the pump & sending unit removal/replacement....this was reconnected for the power supply to the pump test described above. I did put my multimeter ground lead in a few different places on the frame to eliminate bad ground to the meter as an issue. All fuses in the fuse/relay box under the hood are good and I tried the fuel pump power supply check procedure with two different fuel pump relays plugged in.
I have the GM vehicle specific service manual (both volumes) and checked the schematic for the fuel pump circuit. Nothing jumped out at me as the next thing to check. Suppose I could check the gray wire continuity from the fuse/relay block back to the connector pin.
Would greatly appreciate any other recommendations on what to check next or solutions found by other members with similar truck issues in the past.
Thanks!