My 88 firebird 305 tpi died awhile back and I can't figure her out. I've replaced fuel pump, filter, relay, fuse by battery I've jumped power from battery to relay and fp turns on but no start no prime she does have spark no fuel pressure also replaced maf, oil Pressure switch/sending Unit any advice where do I go next ecm? Look for a short. I'vegot no codes or ses lights .

 

If the pump is running and you have no fuel pressure at the engine you have a problem with fuel lines somewhere.

If you disconnect the supply line at the engine ,do you have any fuel flow?
If not possibly a split hose in the tank between the pump and outlet ?

 

I've got some pressure but not till after I try to start the car and fuel pump does a loud whine but no prime or pressure prior to trying to start car all lines and hoses are new replaced when did the fp

 

When pump runs i have pressure in lines its the prime that isn't happening so therefore she won'tstart but after iI crank her over the fuel pump kicks on long and loud

 

When you just kit the key, the pump will only run 4 2seconds unless the ecm gets a cranking signal.
Did you put the sock on the bottom of the pump? clamp the rubber intank PSI line and use the new supplied hose? Do you have enuff fuel in the tank?

 

Yes I put the sock on bottom of pump have roughly 3/4 tank gas and also yes used new supply hose.

 

If it doesn't prime when you turn the key to on/run, but does after some cranking, the following could be the cause.
Once the oil pressure rises to 6-8psi the oil pressure switch closes bypassing the fuel pump relay.
With the engine off and key off supply 12v to the "G" terminal of the ALDL test connector.
It's the lower left pin of the connector. This will power the fuel pump, you should see full pressure on a gauge if you have one connected before doing this.
Possible problems are Fuel Pump Relay, and or ECM assuming all wiring is good.
I and others have posted on this problem so a search should have found it.

 

Thanks I'll have to go give it a try

 

Check that the black /white relay wire has a good ground connection.
Confirm you have 12V on the org relay wire at all times
When the key 1st turned on , check for 12V on the dark green / white wire ( 2 seconds ) to the relay from the ECM that operates the relay
A fail on any of those will prevent the relay working and supplying power to the pump


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So I have 12v constant to orange nothing to the second orange and no power from ecm to the relay so eitherecm is bad or wiring is ?

 

With the engine started and running off the OP switch, see if you have power on the grn/ white wire at relay ?
If you do the ECM is operating the relay in "running" mode but not doing the prime function

If not, pull the harness connector off the ECM and check the grn/ wht wire (ECM terminal A1 ) to the relay for continuity, possibly a broken wire ?
See
http://www.chevythunder.com/fuel%20i...ecm%20#1227165)

If you have continuity but no signal to the relay at any time, consider the ECM at fault