My jeep wont start

my 88 jeep cherokee laredo 4.0 died while driving. fuel pump wasnt working.changed the pump. new one is ingaging but no fuel leaving tank when lines are off at tank.i pluged the return line truck started and ran for the day started about 4 or 5 times no problem sat over night wouldnt start the next morning reseated the pump i can hear the pump but have no gas flow and yes i do have gas in the tank.:runaround:

Make sure you don't have a clogged filter. Easiest and cheapest thing to check before you do anything else.

changed filter with the pump chcked for fuel at the pump itself im totally lost could really use some help:shakehead

FUEL CONTROL
The fuel control system handles actual delivery of fuel to
engine. Fuel from fuel pump enters fuel rail, injectors
and pressure regulator. Based upon a manifold vacuum signal, the pressure
regulator maintains a constant fuel pressure in fuel system of
approximately 31-39 psi, by allowing excess fuel to
return to fuel tank.

Power to fuel pump relay is supplied from ignition switch
when in "ON" or "START" position, at which time the ECU supplies a
ground for fuel pump relay. When relay contacts are closed, power is
applied to fuel pump.
Fuel is drawn through one end of a roller-type electric fuel
pump, compressed and forced out opposite end. Pump capacity is
greater than maximum engine consumption so that pressure in fuel
system is always maintained.

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However, it may be the check valve in the pump has malfunctioned. The only real way to test all this is with a fuel pressure gage installed, usually at the fuel rail.

thanx' changed the fuel pump again' started right up 'whoed of thunkit' always start with the simple stuff right.

Well, glad you got that little thing sorted!

Thanx for the great info guys i feel smarter already valvecover gaskets and tuneups next so im sure ill be back with more please help reqest