new fuel pump fail issues in 1991 vette

Grumpy

The Grumpy Grease Monkey mechanical engineer.
Staff member
BlackRat said:
After changing the fuel pump I drove the car for 30 minutes and it ran great. I can home turned it off and cranked it a couple more times with no problem.
I then checked the codes and came up with H32 , 34, 36 and 38 in the #1 module. And an err in #7. I went in to check code meanings, came back out and it won't start. I am getting a gas smell but I does try to fire.

Some other details:
-I have spark
-Pulled line off the fuel regulator and no fuel came out
-New fuel filter
-New fuel pump
-New cap and rotor
-New ignition module
-New coil

What am I missing?
Thanks
Wade


efisystem.jpg

logic says if the car ran with the new fuel pump installed ,
and you can currently hear the fuel pump run when the ignitions turned on, yet you currently have no fuel pressure at the fuel rail

tpishrader.jpg

fuel_rail_assembly_and_partsa.gif

and when you place a fuel pressure gauge on the shrader valve , then the pressurized line between the new pump and the fuel rail is either plugged or most likely the connection between the tank fuel pump and the fuel lines popped off in the tank, if you have very low pressure the pressure regulator diaphragm may have failed, allowing much of the fuel to flow through with little restriction to build effective pressure or if its only leaking you'll still see low pressure at the fuel rails, as some fuel will still reach the fuel rails but the leak will reduce effective pressure.

ap010cv.jpg


fuelcirc1.png

c4fuelcir.png

fuelpump-1.jpg


READ THE LINKS AND SUB LINKS

http://garage.grumpysperformance.co...ng-like-crap-after-running-out-of-fuel.11309/

http://garage.grumpysperformance.co...-system-trouble-shooting-flow-chart-info.596/

http://garage.grumpysperformance.com/index.php?threads/replacing-a-c-4-fuel-pump.33/

http://garage.grumpysperformance.com/index.php?threads/c4-corvettes-fuel-system-info.67/#post-37351

http://garage.grumpysperformance.com/index.php?threads/c4-c5-corvette-trouble-codes.2697/#post-29270

http://www.rowand.net/Shop/Tech/GMTPISwap.htm

http://garage.grumpysperformance.com/index.php?threads/tpi-fuel-pressure-issue.10385/
 
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