383 dying issue
05-01-2020, 08:47 PM
#1
383 dying issue
I have a 70 Roadrunner, 383 cammed, holley carb/intake, headers, MSD etc.
Car sat for around 2 years.
Replaced bad starter and bad starter relay recently.
Drove the car today, no issues then after around 30 minutes it died in 3rd gear.
Cranked it, it started and a mere 3 seconds later it died again. Had to repeat this process and drive home.
Not sure if its a carb issue(accelarator pump), if its hydrolocking. The clear fuel filter in the engine bay isnt full of gas when cranking. Any advice helps. Car did sit for quite some time so not sure how to diagnose. Thanks.
-berjkara
Car sat for around 2 years.
Replaced bad starter and bad starter relay recently.
Drove the car today, no issues then after around 30 minutes it died in 3rd gear.
Cranked it, it started and a mere 3 seconds later it died again. Had to repeat this process and drive home.
Not sure if its a carb issue(accelarator pump), if its hydrolocking. The clear fuel filter in the engine bay isnt full of gas when cranking. Any advice helps. Car did sit for quite some time so not sure how to diagnose. Thanks.
-berjkara
05-02-2020, 06:33 AM
#2
Mopar Lover
b -
If the gas filter is empty, check the usual suspects: fuel pump (and shaft), fuel lines, and oh yeah, those glass filters (Mr. Gasket) ends have to set a certain way, or you block the flow - don't ask me how I know. Quickest test is to temporarily replace it with a cheap plastic filter.
Not the accelerator pump and vapor lock is rare "while" the car is running. .
Just make sure you're not barking up the wrong tree and confirm spark, but be careful with the MSD.
Archer
If the gas filter is empty, check the usual suspects: fuel pump (and shaft), fuel lines, and oh yeah, those glass filters (Mr. Gasket) ends have to set a certain way, or you block the flow - don't ask me how I know. Quickest test is to temporarily replace it with a cheap plastic filter.
Not the accelerator pump and vapor lock is rare "while" the car is running. .
Just make sure you're not barking up the wrong tree and confirm spark, but be careful with the MSD.
Archer
05-03-2020, 06:01 PM
#3
Archer,
On idle, the clear fuel filter is full with gas, but after around 20-30 minutes of driving, it looks like it’s 1/5 full. Not sure if the reverse flow on the filter is the issue, i feel like it would immediately show a weak flow.
Maybe when the car hits operating temp, the fuel pump gets hot and doesn’t operate correctly. I’ve always believed it to be it works or it doesn’t, and doesn’t go on and off like this. Could it be a gas tank issue... maybe a pressure buildup? Recently put in a new gas cap. Just throwing some more things out there. Anything and everything helps.
On idle, the clear fuel filter is full with gas, but after around 20-30 minutes of driving, it looks like it’s 1/5 full. Not sure if the reverse flow on the filter is the issue, i feel like it would immediately show a weak flow.
Maybe when the car hits operating temp, the fuel pump gets hot and doesn’t operate correctly. I’ve always believed it to be it works or it doesn’t, and doesn’t go on and off like this. Could it be a gas tank issue... maybe a pressure buildup? Recently put in a new gas cap. Just throwing some more things out there. Anything and everything helps.
05-03-2020, 07:16 PM
#5
Mopar Lover
b -
That sounds exactly like what I went through a few years ago. After changing the fuel pump, full fuel line, fuel pick-up in the tank and just about every thing else, it turned out to be the glass filter. Needless to say there's a Russell AN filter in place now, and no more problems.
Another test would be putting a fuel pressure gauge near the carb inlet. If you see the pressure dropping over time, it points to a block in the line - or just replace the filter and see what happens..
Archer
That sounds exactly like what I went through a few years ago. After changing the fuel pump, full fuel line, fuel pick-up in the tank and just about every thing else, it turned out to be the glass filter. Needless to say there's a Russell AN filter in place now, and no more problems.
Another test would be putting a fuel pressure gauge near the carb inlet. If you see the pressure dropping over time, it points to a block in the line - or just replace the filter and see what happens..
Archer
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