I recently bought a 2000 Z28. The car was in a minor accident(meaning went into dith atabout 50-55) deployin both air bags. This accient happend early 2001. The car sat protect till I bought it last spring. I have replaced all the regular things, oil, filters-air, oil and fuel. I am having a huge problem getting fuel to the injector rails. The pump starts up new gas and injector cleaner, and of course the fuel filter. Its not getting any fuel though, it starts right up with a shot of ether, but wont stay running. Any suggestions? Is there a shut off moduale when in an accident or when the air bags go? And if there is where is it located. Any help please.

 

Okay, im getting fuel through the filter. is there any other stop points from the filter to the injectors? i have absolutley no pressure at all.

 

I dont know about a shut off valve but have you checked the fuel pump and wiring? I am not the greatest with this kind of work on vehicles but that would be one thing Id check. that and the lines, they may be corroded or partly blocked. hope that helped.

Jared

 

do you think it could be the lines. With sitting dormant for 5 years with the gas still in it should i just replace the whole fuel line system. someone at checkers auto was mentioning the Fuel Pressure Regulator. is there any way to test this as its in the tank and i dont really want to drop it unless im for sure thats the problem.

 

i was spending some time reading on other fuel related issues and seen something repeated, what is the VATS? and after being dormant for so long what about the anti theft mechnism, what would that have to do with the engine firing up and is it possible for the new fuel filter to be full of fuel from gravity and the pump be shot. the pump does humm for about 3 to 4 sec when the key is turned to on, could it still be a bad pump?

 

Regarding the pump on for a few seconds at Key on, that's normal. The pump is pressurizing the lines so when the injectors open, there will be fuel to spray into the intake ports.

VATS = "V"ehicle "A"nti "T"heft "S"ystem. Your ignition key has a black pellet in it with a thin shiny bar on either side of the key. The shiny bars are contact points for the resistor in the key pellet. When you insert the key and turn the Key, the resistor value is read and checked against the BCM (Body Control Module) stored value. If it matches then the fuel system is enabled. But what can happen is the key pellet gets dirty, the ignition cylinder you put the key in gets dirty, the wires going to the VATS connnector are damaged, broken, etc. Shoebox has excellent references for this and even though his car is an LT1 based car, this particular aspect (VATS, AntiTheft, etc) applies to all 4th Gen Fbodies (though the BCM didn't appear until 96 I believe). Just look thru Shoeboxs' site and check things out.
http://shbox.com/1/how_tos.html

If you still end up stumped, reply to this post. Actually, either way, if you find out what the problem is or not, post what you encountered.

 

there lies the problem the pump does come on i just have no pressure in the lines at all. If the FPR was bad would tht stop me from getting any pressure at all and I can I test the FPR without taking it out of the tank

 

If you turn on the key and the pump runs, thats great. That possibility is eliminated. Pump "on" means the pump is working and the relay is working. Besides, there's a test wire over by the PCM that you can simply apply a 12v source and the pump will run as long as the 12v is applied.
If I were you, I'd start testing the VATS aspect.

 

I second the vats. If you bring your key to a dealer they can test it to make sure the chip is still good.

 

well the car starts and turns over, all electrical works, and pumps cycles. Would it still be a VATS problem when everything works. Im going to throw a pressure tester on the line pre filter to see what im getting, if i get the 60 to 70 lbs the ill hook it to the end of the line b4 the quick connect at the fuel rail. it may be just the sock filter in the pump is clogged or the lines clogged. I sure the hell hopeso, the pump assmbly is 350 to 500 and the pressure regulator is another 80.

 

Concerning the VATS, Have you....
1. Measured your key's resistor pellet?

2. Taken off the lower dash, disconnected the VATS and measured the resistance at the connector with the Key in the ON position? If so, did the resistance match?

3. To verify the pump, use a fuel line disconnect tool to disconnect the fuel lines, drape them over the fender into a 5 gallon bucket, apply 12 volts to the test port for the fuel pump. The gas should flood into the 5 gallon bucket.

4. If all that is good, geta NOID light and connect it to you your fuel injector harness clips. The flashing light during cranking should verify if the FI are firing.

You're not telling us specifically what you've done as far as the VATS testing.

Are you getting a "security' light on the dash during cranking?

 

What's the fuel pressure? Have you actually tested it or just guessing that it's showing no pressure...

Could be fuel pump...

Sometimes we avoid the most obvious due to $$$ or a pita install. I'm guilty.