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Embarrassed to say my car has been sitting since may. I hit a dear last week in my daily driver and it's going to take two weeks to fix it. I had no rental car insurance so I'd rather get the Corvette running and drive it then pay for a rental for two weeks.
The corvette is a 1965 coupe with 327/365 and no modifications other than an LT1 camshaft. Car stalled out after heavy acceleration. Pulled over, cranked for awhile, got it started again. Next day stalled after heavy acceleration again and it wouldn't restart. Towed it home. If I prime the carb by adding fuel into the bowls it runs. if I disconnect the pump to carb fuel line and crank no fuel comes out of the line. Am able to blow air through the carb to pump fuel line easily so I don't think the filter is clogged. There is fuel in the tank.
My guesses are
A) Bad fuel pump. THe pump is about 13 years old but has only a few thousand miles on it. The car sits during the winter is is not driven much during warmer weather.
B) Clog in tank or tank to pump line
Any easy way to diagnose? I suppose I could disconnect the hose at the tank and see if fuel come out and then disconnect the line at the pump (on the tank side) to see if fuel comes out. Thought i'd check here first to see if i'm missing something obvious. I installed the last pump with the engine on stand and i know it's a pain in the *** job with the engine in the car so i want to make sure I know what's going on before pulling stuff apart.
If the car sits for any extended period of time, with any percentage of oxygenated fuel, that will be a problem over time and will lead to some diaphragm issues with your pump. Disconnect the line from the tank to the pump and see what you have re: fuel flow. Just touch all the bases.
Last edited by Dan Hampton; 11-07-2018 at 03:08 PM.
I'd connect a hose somewhere between the inlet of the pump and the tank and see if it sucked fuel. Check to see if the pin has back out on the plunger on the fuel pump. I'd also replace or bypass the fuel filter before I started pulling the pump. I'd also eliminate the sock in the tank starting with trying my first sentence suggestion.
In addition,
It is easy to look into the tank and see if there is a lot of sediment in it plugging the sock.
Look under the car and see if there are any wet spots indicating a pin hole in the fuel line.
Probably 13 year old hoses also, may be cracked and sucking air.
You can crank the car for a few seconds with the fuel line going into a mason jar....you should get a nice flow producing several ounces within a few seconds - this is a volume test. A simple vacuum gauge is also a fuel pump pressure tester......you're looking for 5 to 5-1/2 lbs optimally.
Once you have the volume and pressure test done (hmmm.....15 minutes work maybe) and have confirmed the fuel is clear you'll know where to start looking...
FWIW, I gravity drained my ‘65s fuel tank by disconnecting the fuel line from the suction side of the fuel pump and it flowed out fine with the fuel cap off the tank filler pipe. That would be an easy check for flow from tank to pump.
No kidding. I've never even heard of the problem before.
It's more common occurrence than you know. I had the exact same thing happen this summer on my '66 coupe.
When I removed the fuel pump my pin was missing completely. On the new pump before I installed it, I used Red Loctite around both ends of the pin to prevent it from "walking out" in the future. Very annoying.
I must be in the minority here. The pump on my 57 has a concealed pivot pin. Hopefully I can rebuild it when time comes - still going strong in my 16 years of ownership! I have probably just successfully jinxed myself....
Still surprised that I've never run into/heard of this problem, since I've owned 21 Sting Rays since 1968. Learn something new every day, as they say.
Its happened a lot and even on some new AirTek pumps, I never heard about it much "back in the day" - like - not at all! The later "crimped" pumps such as Ratdog shows don't have the problem....my 63 had one (incorrect) when I bought it.
Last edited by Frankie the Fink; 11-09-2018 at 05:37 AM.
There are, obviously, fuel pumps available out there without the "walking pin". But, if for some reason you can't locate one, you might add something like this to the pump install to keep the pin in place.
I'd connect a hose somewhere between the inlet of the pump and the tank and see if it sucked fuel. Check to see if the pin has back out on the plunger on the fuel pump. I'd also replace or bypass the fuel filter before I started pulling the pump. I'd also eliminate the sock in the tank starting with trying my first sentence suggestion.
I had exactly the same issue. I pushed the pin back into it's house BUT, that is NOT the solution: In my case the pin was slightly bent. If the engine/the pump heated up the rocker stucked.
So I'd advice to replace the pump.
11-07-2018, 03:02 PM
Fuel Pump? Need a check before digging in
