Author Topic: 1967 Fastback with 390FE Stalling  (Read 1232 times)

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Offline GLENN 70

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Re: 1967 Fastback with 390FE Stalling
« Reply #25 on: February 12, 2019, 11:07:10 PM »
No not in your case . If the needle and seats are ok I think I would be looking at the fuel pump . When it stops I would take the air cleaner off and pump the accelerator pump and see if fuel is pumping into the carby .

Offline 289 vert

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Re: 1967 Fastback with 390FE Stalling
« Reply #26 on: February 13, 2019, 09:42:18 AM »
^+1 ... what Glenn said.
Also remove the fuel cap after it dies, to see if it's under vacuum.

Offline pgold

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Re: 1967 Fastback with 390FE Stalling
« Reply #27 on: February 13, 2019, 10:12:50 AM »
Also check condition of fuel line rubber hoses at tank and fuel pump. rubber may have swelled up blocking flow.

Offline jiffy

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Re: 1967 Fastback with 390FE Stalling
« Reply #28 on: February 13, 2019, 01:48:19 PM »
When running it next time and the fuel level drops after 10 minutes, open the fuel cap and listen for a big suck of air while itís still running - a blocked tank vent might cause this.
Or remove the hose from the fuel pump that goes back to the tank and blow HARD through it.
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Offline barnett468

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Re: 1967 Fastback with 390FE Stalling
« Reply #29 on: February 14, 2019, 12:19:15 PM »
Unless the tank has been recently replaced, it could also be sucking up rust in the tank clogging the in tank filter, then when the engine dies, enough rust usually falls off the filter allowing it to start again.


Offline GSD

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Re: 1967 Fastback with 390FE Stalling
« Reply #30 on: February 16, 2019, 10:02:25 PM »
So the latest is that I changed the fuel pump just in case, but this is not the problem. I rang it for 20 minutes with the new fuel pump a couple of times and it is still stalling. After stalling I pressed the accelerator and fuel is being delivered to the carby. I then held the accelerator pedal to the floor and the car restarted with lots of smoke coming out of the exhaust. I assume this means the car is flooded. So should I be checking the float levels?

I appreciate your advise guys.

Offline GLENN 70

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Re: 1967 Fastback with 390FE Stalling
« Reply #31 on: February 16, 2019, 11:02:43 PM »
It's back to the needle & seats . You should reset the float levels and see what happens but take them out 1st and clean them .  U tube how to do it if you  don't know how ,or if someone that knows how to do this  you can get to help you . It's not a hard job . 

Offline USA066

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Re: 1967 Fastback with 390FE Stalling
« Reply #32 on: February 17, 2019, 01:00:37 AM »
If your engine, fuel pump, etc is all good mechanically, I think there are a number of things here:
If your fuel is boiling, a couple of things you could try::
1. A thicker phenolic spacer, about 1/2Ē instead of 4mm
2. Install a heat shield under your carby. Holley do them for around $80.

But, if you donít know how old your carby is or if not original to the engine, I would chuck it and replace it with a Holley Quickfuel.
A friend has a 67 390 FB (same as yours), he put a QF (750cfm I think, but not sure), says it ran great straight out of the  box.
I have just installed a QF 600cfm on a 331ci in my 66, had to adjust the idle fuel mixture a bit but now runs great.

The positives about these carbys are, 1. Float levels are pre-set, no need to adjust 2. Has a window so you can see the fuel level 3. Easily tuneable (idle mixture screws). 4. Not affected by heat issues like older carbys. Honestly, the best $600 I have spent.

If still not convinced, there is a guy in Perth should talk to. His name is Peter and he is an expert on Holleys and knows  what he is talking about. He was recommended to me, and I know very little about carbys. His number is 0455602618.
Good luck.
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Offline barnett468

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Re: 1967 Fastback with 390FE Stalling
« Reply #33 on: February 17, 2019, 12:59:54 PM »
I rang it for 20 minutes with the new fuel pump a couple of times and it is still stalling.

You let it idle for 20 minutes or drove it for 20 minutes?


After stalling I pressed the accelerator and fuel is being delivered to the carby.

Could still be low on fuel because the accelerator pump is on the very bottom of the carb.


I then held the accelerator pedal to the floor and the car restarted with lots of smoke coming out of the exhaust.

Why didn't you try top start it normally?


I assume this means the car is flooded.

Possibly.


So should I be checking the float levels?

You should have done that first a week ago.

 

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