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Old 03-21-2013, 01:26 PM
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Update on chugging Avanti's 350

After testing my coil in the HEI and finding everything fine, I decided to dig a little further into the distributor and found the wire harness that gazinta the module cracked and decided to replace it along with the capacitor. Heck, I also bought NAPA's best (USA made) module and, using the heat sink grease, installed it, too.

No change! Car ran fine for 30 seconds then chugged and died again. AARGH!

Okay then... back to fuel delivery. My Studebaker pickup with the 289 also has an Edelbrock 1406 carb so I swapped them this morning. The truck's fuel inlet has a fuel pressure gauge which I also transplanted to the Avanti's 350.

On start up, the engine ran smooth and I quickly ran over to see what reading I had for pressure. On the truck, it would show a steady 4.5 lbs from the mech. pump. On the Chevy engine, it was rapidly fluctuating between nothing and maybe 1 pound. A-HA! me thinks... then the gauge went to zero and didn't move. Engine died shortly thereafter.

I have pulled the pump and will replace it. If that's not the problem, I told my wife I'm going to kill myself. she laughed.

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Old 03-21-2013, 03:19 PM
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Hope it fixes your problem, but if it doesn't don't forget the hose between the tank and hard line could be dry rotted(1963 to 2013=50years). Thats a long time for a rubber fuel line.
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Old 03-21-2013, 08:14 PM
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You have one extremely understanding and compassionate wife LOL.

I would say don't touch the fuel lines at all as I had previously mentioned in another thread to clear out if plugged, but just install the new fuel pump so you KNOW its the fuel pump or not first, then proceed elsewhere if needed.

Also what I mentioned before, check that oil level and if you suspect any fuel dilution because of a ruptured fuel pump, get that oil dropped before you drive it as too much fuel in oil will ruin the cylinder walls to ring seal and then it will become an instant oil burner.
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Old 03-22-2013, 09:04 AM
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Thanks so much for the help, guys!

I'm learning a lot with the engine in my car and another 350 I'm rebuilding in the garage. Hoping to have a project car to put it in later this spring.
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