Question about Ford Taurus
Fuel pumps don't necessarily have to perform full pressure to function. But to perform within specification is what you're looking for. In other words, a fuel pump with a specification of 45 PSI could still work at 20 or 25 PSI. A lot of times when a car runs out of gas this is very bad for an electrical fuel pump. When you press the pressure valve close to the manifold the pump cannot build enough pressure in a closed system to emit a big spurt as if the pump was working to at full pressure. It still may have pressure so when you open the system by pressing in the valve a pump with 20 to 25 PSI still will make a big spurt because the pump is pushing fuel to a lower (no pressure) point, (the open valve). Check your fuel pressure with a fuel pressure test kit, you can usually borrow one from an auto parts store. Screw the connector on the same valve you tested for fuel and just turn the key to the on position. The car does not need to be started. Some vehicles do not use the valve in the tester so be sure to check both before you find you do or don't have fuel pressure. A car with low pressure will not run just like a car with no pressure. Sometimes you may have a hard start condition. If you can get the vehicle started with starting fluid the vehicle may continue running because there is enough but not sufficient fuel pressure at idle. The pump may be able to supply ample pressure at idle because pressure is relieved when the injectors are open (dispensing fuel into the cylinders) so the pump is not working as hard.
Posted on Mar 22, 2011
If you have gas spurting through the valve when depressed, you fuel pump should probably be alright-but that can only be determined with any certainty with a fuel pressure tester. I would think it the volume of fuel was a decent amount, your pump is alright. When you try to start the car you should NOT step on the petal-that shuts off the injectors.
Does it even sound like it wants to start? Or does it just crank?
Posted on Mar 22, 2011
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Posted on Jan 02, 2017
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