Question about 1991 Chevrolet Caprice

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I just need the fuel pump psi range so i can get an external pump to replace in in tank one

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You are better of replacing the in tank pump,but if you still want to try it the presure is 40lbs!

Posted on Aug 05, 2010


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im guessing here , but what im thinking your asking is, "hey my intank fuel pump has gone bad can I substitute an external fuel pump for it on my throttle body injected vehicle " ??? does this sound close ?
if so then heres what I know about em.
the intank pumps don't require a fuel circulation loop because they use the fuel in the tank to cool the pump at low flow times (idle) , if you were to use an external pump it [pressure would have to be close to the intank model (50 to 80 psi) and in the interest of safety all the connections would have to be swaged or threaded ,no hose barbs and clamps also if there isn't already installed a fuel return line would need to be plumbed in as well or pump will overheat and leak fuel , as well the old pump would have to be removed from tank as fuel flow wouldn't be enough at full throttle thru the dead pump and then a new outlet pipe would have to be fabbed up , so to answer your question if I got it right ? is yes but why would you want to you'd end up changing so much stuff it be easier to just get a new pump !!

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Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.

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