What would cause car that normally run perfectly suddenly quit any time you apply accelerator

1990 TOYOTA CORONA
234,000 MILES • 4 CYL • FWD • AUTOMATIC
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SKYWALKER455
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I own this vehicle for the last twenty years and it ran perfectly until recently. I was driving home when I noticed that if I apply acceleration the car would lose power and then stall. Initially I thought it might be the fuel pump but then discovered their was no electrical power getting to the fuel pump. I had a retired auto shop own look at it and he discovered the fuel filter in the fuel injectors were cluttered with contaminates.

Even after he clean injectors filter the car would still idle for a time but then stall. If I tried to drive on level surfaces it would limp along. If I try to climb a moderate incline it would crawl up the incline and then stall. If I left it running in idle it would eventually stall.

Could it be my fuel pump? If not what else would be causing my problem?
May 30, 2014 at 9:11 AM
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HMAC300
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check fuel pressure with a gauge autoparts rent it may be low pressure
May 30, 2014 at 9:26 AM
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SKYWALKER455
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Checking the fuel pressure would that necessarily tell if my fuel pump is no longer working? If so why would the fuel pump sometime work and not others?

If it isn't the fuel pump would other cause would produce this type of malfunction?
May 30, 2014 at 9:45 AM
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HMAC300
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well the no electrical power for one which would mean a short in the wiring but for a car that is 25yrs old that cold be expected. fp should be 30-37w/vacuum hose connected at iidle. and 38-44w/o after you shut it off it shold hold within 5-10 psi. if your pump isn't working all the tiem then you'll have toseeif it's abad relay or short or both.
May 30, 2014 at 12:16 PM