I replaced the fuel pump and fuel filter on my 1996 Chevrolet S10. (As well as some gas lines.) When I start the truck, fuel is leaking from a small black box that is located under the bed of the truck, connected to the fuel pump and the charcoal box. This small black box has a small red tab, as if there may be some sort of switch or relay inside, I am not sure why the fuel is leaking or what this little black box is. Can someone please help?!
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Re: Little Black Box, Fuel Pump, Fuel Lines
It sounds like you have a line hooked up to the wrong spot, and that little black box sounds like the charcoal canister, which is used to filter out fuel vapors. it sounds like either the supply or return line has been hooked into the vapor line. retrace your steps, largest diameter line is supply, medium is return, smallest line is vapor line. good luck!
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fuel relay(under hood black square, should click when ignition is turn on) fuel lines, fuel filter(under driverside back of door inside frame) or fuel pump on top of tank. I would disconnect the fuel filter on the backside to see if the pump is pumping fuel, if it is then I would hook it back up and remove the front hose on the filter, if fuel is coming through then I would disconnect the line at the engine and check for fuel, hope this helped Tim
Thanks for choosing FixYa and welcome to the site. Fuel is pumped out of the tank by the fuel pump. It then goes to the fuel filter. Then, it goes through the gas lines to the injectors and engine. You need to scan your gas lines and make sure they are not damaged or clogged. If the lines are ok, you need to check your injectors. Check your fuel pump fuse/relays and reset button, if equipped. I am guessing the car will not start? Thanks for using FixYa.
There are several common fixes for this problem. Fuel spider is one, fuel pressure regulator is another. However, the most common and likely is your fuel pump module assembly. The fuel pump has to be able to hold pressure from the fuel tank all the way to the regulator. It works just like a foot valve on a well. When it goes bad it let's the fuel in the lines & fuel filter bleed the fuel back to the tank when not in use.when you try to start it after it sits, the fuel has to flow all the way back to the engine. Although the fuel pump is the most expensive of these items, more often than not, that will fix it. Fuel filter should also be checked and replaced if installing a new pump.
1. Does the pump actually run (key on engine off) pump should run for 2 seconds and go off and can be heard if you listen at the filler neck with the gas cap removed)
pump not running - Check relay (replace if bad) check wiring/fusese
Pump runs... go on to #2...
2. check the gas guage. is the gauge reading in the normal area it would read in or is it way way off like WAY above full or way below empty? This is a sign the electrical connection at the pump is plugged in backwards and the pump is spinning the wrong way and not picking up the fuel... (This is easy to get plugged in backwards inside the tank when installing the new pump)
3. Check for feed, return and vent lines being installed wrong where they attach to the tank... they can easily be hooked up wrong and fuel is either pumped up in to the return line or pumped in to the fuel tank vent line..
4. check for kinked or crushed fuel lines from tank to engine.
5. check fuel pressure regulator to be sure its not stuck open.
ko how much gas ya got ? pop a fuel line real quick or a service port at the engine. is there fuel ?
crack the line at the fuel filter (might as well replace it while yer there) does fuel even make it to the filter ? no ? mm sounds like a come back to me. you need to QC your work remove the fuel pump again (lol) and make sure you have not cracked or broke anything. then make sure all your lines are attached properly with no cracks along the way. make sure the fuel pump sock is clean. good luck
Like Kristisamp Said check the Fuel pump relays, they are little black box shaped fuses in the glove box, there are 3 of them, I think there may be a cover over them so you can see it......
Take the cover off and there you go......
I have a 96 blazer 2 door that had the same problem, I repalced thes relays and Bam!!! fired right up........
Try checking the black box located just above the spare tire on the chasis side alot of the fuel lines go to that box, in my case i just forgot to connect one ground wire that comes from the black box. let me know if this helps you.