Fuel Pump Issues
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Fuel Pump Issues
I was having trouble starting my 99 4 cyl ranger, and was able to narrow the problem down to the fuel pump. When I turn the ignition on, the fuel pump wouldn't turn on and we were still getting power to the pump. After checking voltage at all available connections, I turned the ignition on to see how much gas was in the gas tank (to see if we needed to drain it before dropping it) and sure enough, the fuel pump kicked right on, and truck started right up. Just about every other start, the fuel pump won't kick on. I assume this is an electrical problem, but I'm getting good voltage readings all the way down where I can check. Any ideas??? Please help.
Cargo Master
Joined: May 2004
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Sounds like a loose connection. Check the wires connections starting at the fuel tank and going towards the engine compartment. Disconnect and clean and reconnect.
Check fuel pressure to ensure fuel pump status.
Check fuel pressure to ensure fuel pump status.
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ccmeigs, Did you ever resolve your fuel pump issues? I was having the same issue. 2000 Ranger 4.0, fuel pump would not energize and truck would not start then for no reason it would work and truck would start. I pulled the bed off and checked connections, had power to pump harness so I'm sure its the pump. Its just strange how it works off and on but I did notice the truck runs rough now, so it may have pressure issue so I guess I'll replace the entire hanger assy. Its just so expensive and I'm not sure which pump brand to buy.
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I got under the truck to see what I was in store for and started spraying bolts down with pb blaster. I turned the ignition on to see how much gas was in the fuel tank to see if I needed to drain it before dropping it, and the fuel pump kicked right on. I turned it over and the truck started right up after not cooperating for over 10 days. I haven't had a problem with it since. I don't any idea why or what was causing it, but for now, it's running great again!
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From: SW Va
Did you do the voltage tests under load???? If not, no load operating voltage can look ok, but can drop because of excessive in line resistance, when the fuel pump load is applied.
Maybe try swapping out the fuel pump power relay with a like one not neeed to run the engine & see how it goes, as these relays & their contact resistance is a known problem point.
If no joy, maybe consider trying a 20oz size of Techron Concentrate Plus at the pump, before filling up with Chevron, Texaco, CalTex, or now Shell, all of which have PEA in their recipe & with the 20oz Techron, will raise the treat rate 10X above pump gas alone.
Chevron says Techron is able to tidy up fuel sender corrosion & wake up a dead fuel gauge, SO, if the intermittent fuel pump condition is being caused by corrosion on the pump motors aramature, maybe the Techron will clean it up & fix the intermittent no run condition????!!!!
At the least, it'll tidy up the fuel injectors, intake valves, piston crowns & combustion chamber deposits & get it ready for winter.
Oreillys has Techron on a bogo deal.
More thoughts for consideration, let us know how it goes.
Maybe try swapping out the fuel pump power relay with a like one not neeed to run the engine & see how it goes, as these relays & their contact resistance is a known problem point.
If no joy, maybe consider trying a 20oz size of Techron Concentrate Plus at the pump, before filling up with Chevron, Texaco, CalTex, or now Shell, all of which have PEA in their recipe & with the 20oz Techron, will raise the treat rate 10X above pump gas alone.
Chevron says Techron is able to tidy up fuel sender corrosion & wake up a dead fuel gauge, SO, if the intermittent fuel pump condition is being caused by corrosion on the pump motors aramature, maybe the Techron will clean it up & fix the intermittent no run condition????!!!!
At the least, it'll tidy up the fuel injectors, intake valves, piston crowns & combustion chamber deposits & get it ready for winter.
Oreillys has Techron on a bogo deal.
More thoughts for consideration, let us know how it goes.
