Disconnect these hoses and tightly plug the inlets on the tank with rags or duct tape to limit fumes and the possibility of a fire from a spark. You can unplug the C4 connector and pop it open to inspect the contacts. Took the new pump back out and looked inside the top connector - contacts for pump power were discolored common sign of over-heated pins , and no longer made a good connection. Problem; bouncing solved problem every time. The image came out very tiny, but it looks like it is the same one the dealer gave me. Slowly lower the tank a bit to access the electrical connection.
Can I tell if my fuel pump needs to be replaced? It occurs when your original fuel pump fails and you replace it with the newer style Delco that requires the harness end to be changed. Here is further information: no error code stored, pump is internal so wires can't be observed, no warng lights. Be careful not to damage the tank with too much presure from the jack. Yes, I crimped on the new plug when I replaced the original pump with a Delphi pump almost exactly one year ago. When I first turn on the key, the fuel gauge jumps to the extreme right, then to the left and then shows the correct amount of gas in the tank. Then it failed again and I pulled on some wires and it seemed like it corrected a short and it started working.
So, if one needs to disconnect the fuel pumps from functioning, then the only effective method is to disconnect the fuel pump relays. Had already replaced the fuel filter and distributor cap so this was my last resort. I suspect the pump as well, I just want to be sure. I dropped the tank again and this time I cut off the wiring pigtail and replaced it with a new one. You May need to pry up on the pump to get it out. Mmm- the site wouldn't let me log in yesterday.
The old unit had not completely failed but it was taking two-sometimes three cranks to get the engine started up and also rough idle. Then you will need a partner or helper. Be sure to replace the plastic security locking strap on the electrical connection. I also learned the pump bearings are lubricated by the fuel, and driving on Empty a lot will shorten the life of the pump. Total voltage across the pump was about 11. Other signs are surging and sputtering of the engine, which indicate that an improper amount of fuel is being pumped into the engine.
I have reviewed the fuse map on the inside cover of both fuse boxes - no fuel pump fuse just the fuel pump relay switch. Problem solved, and it's been over a year now. I would not use rubber hoses not good with alcohol and other gasoline additives and injectors. You will see one large fuel filler hose and one smaller vent hose. Use the jack to continue raise the tank into place.
Assuming the pump is good, as well as the power and ground wires. Crawl under your truck with a test light to see if you're sending juice to the pump. Nice to know where all the grounds and wiring run. Best of luck I found it quite easy compared to some European cars I have had. I have dropped the fuel tank, and replaced the fuel pump 5 times, the plug and wires on the fuel pump, the fuel relay, you name it I have fixed it at least twice. If it does click, it's working. I'll have to drain again, and check for power back there.
Re-charged the battery, started fine an hour later - now the fuel gauge jumps. I'm sure the holes were produced when I scraped off the dirt that accumulated above the edge of that pad last year when I had the fuel tank completely removed. I'll keep narrowing down options. I saw a video where scannerdanner measured about 7. As I mentioned in my first post, I have installed a seperate ground lead staight from the battery to this location and to my trailer connector. My truck 97 Suburban K1500 4wd has three wires and a ground.
So, I ended up jacking the 4 mini spring clips with a mini slot head screwdriver as I pulled the connectors at odd angles. I've done all the work myself, the job isn't too bad, the worst part is draining the tank. Buy now and replace that failed original part! Clean around the top of the pump to limit dirt from entering the tank when you remove the pump. It felt like a random loss of ground, but after 7-years I figured it was time for a new pump. Then they replaced the pump. Be sure to disconnect all the hoses on the tank before dropping it.
It has been in for over three years now and still running strong. There are about a half dozen bolts on the skid plate, and the two bolts on the removable ends of the tank straps. Check the relay first although the pumps are famous for failure. I will keep you updated. Position the jack under the fuel tank between the two fuel tank support straps, not under them. This item Fuel Pump Assembly for 98-99 Chevrolet Suburban V8 5. I saw a video where scannerdanner measured about 7.
I then called a tow truck and had it taken to a shop. If you crawl in front of your rear driver side tire, look at the middle of the tank. The reason I say very slowly is that the fuel lines are not long enough to lower the tank all the way to the ground. Delphi T-23 Automotive Turbine Fuel Pumps provide excellent low-fuel delivery performance for reliable, uninterrupted fuel flow. Suggested carbon build up on throttle as problem causing computer to shut down.