Stalling During Hard Acceleration

[64Stingray]

327 365horse, just purchased car a month ago, ran fine to 5800 rpm thru all gears, good power. Now after car is warm accelerates well thru 1st gear then acts like it is running out of gas? Fuel pump was replaced 3 years 3000 miles ago similar symptoms. The other night while accelerating it stalled again then would not stay running, would start then die. I let the car set for a day it started and ran fine. I only ran it in the parking lot for fear it would leave me stranded again. Changed fuel filter in the middle of all this, didn't seem to help, tank is clean, vented gas cap seems to be working? Any ideas?

 

[pax]

I would be inclined to change out the coil and try that. Often when they go they will work cold and as they warm up they start shorting out inside providing less spark and giving the feeling you are running out of gas. There is a way to meter them or you could go to an auto electric shop but I would just change it for what it is worth.
Did you check the fuel pump for weeping or dripping?
Let us know how you make out.
good luck,
john

 

[Mac]

Changed fuel filter in the middle of all this, didn't seem to help, tank is clean, vented gas cap seems to be working? Any ideas?

Which fuel filter? On some carbs (Rochesters) there is a brass filter at the carb itself which can cause exactly the symptom you're describing if plugged.

Another obscure problem to check is the condition of your ground straps. If your engine ground straps are intermittently gapping (corrosion) it'll make weird stuff happen like this.

Good luck!!

 

[Subfixer]

I had the same problem and thought it was the carb or fuel problem somewhere. Turned out to be a bad coil as previously posted. Worked well cold, but died when hot.

 

[Grizzly]

Of one thing I am sure, coils are used up just like points, rotors and caps. If you want to keep it orginal, pull that GM coil off and get one from MSD or ACCEl. But change those coils.

 

[64Stingray]

stalling problem

Pulled the fuel pump off today, found the pivot pin had slid out of the fuel pump causing low fuel pressure. Thanks for the replies.

 

[Tom Bryant]

One other thing to keep in mind on these older cars is the flexible fuel line from the frame to the pump. If it is old and soft on the inside it can suck shut (collapse) under hard acceleration effectively shutting off the fuel. It may open up after the engine dies or stay shut for a while preventing restarting.

Tom

 

[Mac]

One other thing to keep in mind on these older cars is the flexible fuel line from the frame to the pump. If it is old and soft on the inside it can suck shut (collapse) under hard acceleration effectively shutting off the fuel. It may open up after the engine dies or stay shut for a while preventing restarting.

Tom

A good argument for hard lines from end to end- and make mine stainless!

 

[JP1522]

Mac 73, You don't want a hard line between the fuel pump and the frame mounted gas line--unless you replace the steel/rubber flexable motor mounts with one piece, solid steel, non-flexable, ones.

 

[IH2LOSE]

I STRONGLY recomend steel fuel lines on the positive side of the fuel pump.On the vacum or suction side it will only spill out or drip out.On the positive side it will SPRAY OUT when the fuel pump is on.

I fine atomized spray is more dangerous spraying on the motor from a tiny pin hole then a broken line spilling fuel.

No broken line is a good broken line but is always disturbing to me to see rubber hoses on the positive side of the fuel pump.And although its a nusance to make one if you have an aftermarket carb,All the lines,adpter,tubing benders,flare blocks are available real affordable.

It always seem I see a car with brand new paint,new stereo,new wheels and tires,and then see rubber fuel lines on the positive side of the pump and old original brake hoses and lines.

SAFTEY FIRST if your not worried about your self worry about the inocent people out there

NOT TO SAY the owner of the car on this post has any unsafe items its just we were speaking of fuel lines and I had to add my 2 cents.