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At times my vrscdx run terrible at about 1/2 tank of fuel. It back fires and will not accelerate. it runs fine after a fill up. oh its a 2008 w/ 9500 miles. Thanks for any advice
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Damaged/clogged evap canister. You probably overfilled fuel tank one too many times and caused damage. Evap canister is kind of charcoal filled canister located on your fuel system vent. When tank is overfilled gasoline reaches evap canister and and makes charcoal to became hard like clay. Once that happens fuel tank looses its vent and fuel pump cannot pull fuel because vaccum created inside fuel tank.
Hmmm ,it seem to be a fuel problem! Even if you hear the fuel pump,it may come from the fuel line inside the gas tank feeding the injectors. Check inside the gas tank to see a broken line or perforated!
I certainly wouldn't rule out a fuel restriction, either in tank where fuel drains to line, or line(s) to carburetors. When cold, more fuel required, plus once engine starts to run, vacuum from carbs may overcome restriction, as well as less fuel required. My guess is that heavy acceleration is a problem even when warm as well. Doesn't take long to check in tank to see if filter/screen in tank is plugged at all, as well as remove fuel line for carbs and use compressed air (carefully) to clean out line(s) as well as blow back into tank to dislodge debris at screen in tank, but if there is debris, remove tank and flush good. Any in-line filters should be replaced as well.
install clear plastin line in the return from the injector pump, any air in the fuel means trouble, somewhere in the fuel system its drawing air , usually neat the tanks, but not leaking enough for fuel to leak
Best guess I can make with the limited info is check the fuel cap vent. If it runs fine with the cap off or open you found the problem.
Engines that are running very lean (not getting enough fuel) can sound terrible, Frank
check th fuel filter - does this happen when below 1/4 tank of gas? there is a filter in there too. a clogged filter will be worse at acceleration - if it is at 1/4 tank or less when this occurs - try filling up and see if that helps - when you drop below 1/4 tank you will **** up trash from the bottom of the tank! hope this helps
make sure the high voltage lead to the sparkplug isn't touching anything metal on its way to the plug. the clicking may be the high voltage discharging to a metal part, not the plug. those wires age during use.
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