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check for power to the pump and check the earth connection for the pump. Check if you have a fuel pressure sensor in the fuel manifold and if you have check that it is operational and energising the relay from the ECM
if one of the o rings on the fuel pump moved when you installed the new pump that may cause you to have no fuel pressure. i have had the same problem once before and it was one of the o rings on the fuel pump. lubricate the o rings with vasaline before installing
Could be low on freon or a relay / switch problem. Could also be a problem with the ac clutch on the compressor. You can check the freon charge first, or check the clutch for voltage when the system cuts off.
b/c u don 't have one u have c/opn relay ( circuit open relay ) that controls the fuel pump. which is located under hood fuse box a long the driver fender. good luck
the other areas the fault could be located are in your meter circuit plate (which is part of your combination meter), it could be in the wiring, or possibly your multi display (also part of your combination meter)
I looked up the codes you posted.
P0420 is showing a bad oxygen sensor on bank #1, the one down by the catalytic converter.
P0773 is an electrical problem with the shift solenoid E.
A bad oxygen sensor would cause lower fuel milage.
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