"Overheating" --> Now Fuel Delivery Issue --> Dirty Tank?

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

Bruce Wingate

Full Access Member
Joined
May 20, 2021
Posts
154
Reaction score
89
Location
Long Island
First Name
Bruce
Truck Year
1984
Truck Model
K10
Engine Size
350
New or worsening problem with my '84 K10 (350 SBC) that I would describe as overheating, but I don't think that it is: After 20 minutes of local around town cruising or shortly after getting off the highway and hitting the local roads, the truck sputters, dies and won't restart. The glass fuel filter under the hood is empty. If I let it cool down for 45 minutes to an hour, it will restart and run fine - I usually head home when this happens, so I assume it will recur, but don't know for sure.

Flushed and changed the antifreeze and confirmed that it was flowing and the thermostat (unknown temperature) opens; the engine leaks A LOT of oil but not on the ground (an engine swap is planned but I am hoping to put it off for a year); oil was recently changed. Water pump is a Holley front mount system and relatively new (~3 years)

I don't know the engine temp - will hook up a guage this weekend and also check with an infrared thermometer.

Any suggestions on where to start looking? My only thought is that the fuel pump rod is somehow worn out put thats a total WAG.

Thanks,
Bruce.
 

legopnuematic

Licensed Junk Dealer
Supporting Member
Joined
Oct 27, 2016
Posts
1,911
Reaction score
4,196
Location
MO
First Name
Spencer
Truck Year
1971, 1̶9̶7̶4, 1976, 1979,1̶9̶8̶5, 2002
Truck Model
Dart Swinger, Sierra 10, C10 Cheyenne, C10 Big Ten, Silverado 10, Ram 2500
Engine Size
225/6, 350 c.i., 350 c.i., 5.9l Cummins
Single or dual tank truck?
 

squaredeal91

Full Access Member
Joined
Mar 10, 2023
Posts
2,026
Reaction score
3,544
Location
Cave junction Oregon
First Name
Greg bush
Truck Year
1991 SB
Truck Model
K30
Engine Size
5.9 Cummins 12 valve
Very well could be your fuel hoses sucking air. It's common but not the easiest to find.
 

TotalyHucked

Full Access Member
Joined
Feb 24, 2020
Posts
3,081
Reaction score
9,862
Location
Auburn, Georgia
First Name
Zach
Truck Year
1985
Truck Model
Sierra 1500
Engine Size
5.3
Yeah, we need some more info. Single or dual tank truck, what pump you're running, do you still have the stock metal line from the pump to the carb, what carb are you running, etc.

Also, GET RID OF THAT GLASS FUEL FILTER. Seen too many rigs on fire because of those
 

Rustisbest

Full Access Member
Joined
Jul 20, 2021
Posts
70
Reaction score
178
Location
Athens, TN
First Name
Matt
Truck Year
1979
Truck Model
C10
Engine Size
377
Vapor lock. Hoses/lines too close to exhaust. Or running a pump without the return might do it.
 

GTX63

Full Access Member
Joined
Nov 27, 2022
Posts
802
Reaction score
3,212
Location
Tennessee
First Name
Ty
Truck Year
1985
Truck Model
K10
Engine Size
350
After 20 minutes of local around town cruising or shortly after getting off the highway and hitting the local roads, the truck sputters, dies and won't restart. The glass fuel filter under the hood is empty. If I let it cool down for 45 minutes to an hour, it will restart and run fine - I usually head home when this happens, so I assume it will recur, but don't know for sure.

For the motor to overheat to the point of stalling the motor, you would smell it, hear it and see evidence of overheating.
If the fuel filter is empty immediately after the truck stalls, there is a restriction due to debris, leaks, collapsed line or vapor lock.
 

squaredeal91

Full Access Member
Joined
Mar 10, 2023
Posts
2,026
Reaction score
3,544
Location
Cave junction Oregon
First Name
Greg bush
Truck Year
1991 SB
Truck Model
K30
Engine Size
5.9 Cummins 12 valve
New or worsening problem with my '84 K10 (350 SBC) that I would describe as overheating, but I don't think that it is: After 20 minutes of local around town cruising or shortly after getting off the highway and hitting the local roads, the truck sputters, dies and won't restart. The glass fuel filter under the hood is empty. If I let it cool down for 45 minutes to an hour, it will restart and run fine - I usually head home when this happens, so I assume it will recur, but don't know for sure.

Flushed and changed the antifreeze and confirmed that it was flowing and the thermostat (unknown temperature) opens; the engine leaks A LOT of oil but not on the ground (an engine swap is planned but I am hoping to put it off for a year); oil was recently changed. Water pump is a Holley front mount system and relatively new (~3 years)

I don't know the engine temp - will hook up a guage this weekend and also check with an infrared thermometer.

Any suggestions on where to start looking? My only thought is that the fuel pump rod is somehow worn out put thats a total WAG.

Thanks,
Bruce.
Kinda sounds like fuel delivery. Maybe bad hose sucking air intermittent maybe. Does your oil smell like fuel? Might be a bad fuel pump diaphragm?
Or could be a symptom of a failing ignition component.
 

fast 99

Full Access Member
Joined
Dec 31, 2021
Posts
1,778
Reaction score
2,466
Location
Spokane, Washington
First Name
Brian
Truck Year
81,85
Truck Model
K20
Engine Size
350
Vapor lock more times than not is caused by low fuel pressure.

Think of it like a pressure cooker. Boiling point increases with pressure. Today's fuel is not designed for carbs, exacerbating any low fuel pressure issues.
 

Latest posts

Forum statistics

Threads
42,840
Posts
923,367
Members
34,416
Latest member
Lauren
Top