Fuel delivery woes
Posted: Sat Sep 09, 2023 7:32 pm
I have been enjoying my '62 D200, my first Sweptline.
A couple weeks ago I idled for too long while talking to a neighbor. Truck died while I was sitting in it, and wouldn't start back up.
I left it overnight, the next day it started up fine. Started driving home, engine got up to running temp -- and started stumbling any time I'd give it a touch of throttle. Barely limped it home at low speed.
Seemed like vapor lock / fuel delivery issues / air in the fuel so I did a few minor things:
* Pulled air cleaner and verified i'm getting two nice jets of fuel when i pull the throttle
* swapped out the inline fuel filter
* replaced some of the old crusty rubber fuel lines between tank and fuel pump
* pulled & check my fuel sending unit
* replaced a crusty vacuum hose from carb to timing advance
* replaced a cracked rubber cap on one of the unused carb ports
* checked the heater riser on manifold to make sure it wasn't stuck shut (butterfly flaps were in fact long gone, so that wasn't it)
* poor man's carb cleaning with a bottle of spray
* spray started fluid around the base of the carb to see if it is sucking air at the manifold, no sign of a leak
After each of these I did a test drive - the stumbling was always present.
Truck now cold starts and idles. maybe better than ever before! but still is stumbling under throttle, and if the weather is hot, having trouble with hot starts like the fuel is vaporizing or ???
is it Carb rebuild time? New distributor time? Anything else I should try before I get more drastic?
The only thing I can think of is this... the vacuum timing advance hose was pretty bad, like crumbling and melting. Maybe some crud got sucked into the diapraghm on the distributor, or the port on the carb, and the timing advance is jacked up?
I've nearly exhausted my amateur weekend warrior mechanic skills lol.
A couple weeks ago I idled for too long while talking to a neighbor. Truck died while I was sitting in it, and wouldn't start back up.
I left it overnight, the next day it started up fine. Started driving home, engine got up to running temp -- and started stumbling any time I'd give it a touch of throttle. Barely limped it home at low speed.
Seemed like vapor lock / fuel delivery issues / air in the fuel so I did a few minor things:
* Pulled air cleaner and verified i'm getting two nice jets of fuel when i pull the throttle
* swapped out the inline fuel filter
* replaced some of the old crusty rubber fuel lines between tank and fuel pump
* pulled & check my fuel sending unit
* replaced a crusty vacuum hose from carb to timing advance
* replaced a cracked rubber cap on one of the unused carb ports
* checked the heater riser on manifold to make sure it wasn't stuck shut (butterfly flaps were in fact long gone, so that wasn't it)
* poor man's carb cleaning with a bottle of spray
* spray started fluid around the base of the carb to see if it is sucking air at the manifold, no sign of a leak
After each of these I did a test drive - the stumbling was always present.
Truck now cold starts and idles. maybe better than ever before! but still is stumbling under throttle, and if the weather is hot, having trouble with hot starts like the fuel is vaporizing or ???
is it Carb rebuild time? New distributor time? Anything else I should try before I get more drastic?
The only thing I can think of is this... the vacuum timing advance hose was pretty bad, like crumbling and melting. Maybe some crud got sucked into the diapraghm on the distributor, or the port on the carb, and the timing advance is jacked up?
I've nearly exhausted my amateur weekend warrior mechanic skills lol.