[72c20customcamper]

Originally Posted by trevarthan

Hello,

I've got a 1971 c10 lwb with the 4.1L straight six.

Recently it has started losing power after driving for awhile (random intervals - as much as an hour, as little as a few minutes). Sometimes this is a complete stall, but sometimes it's just a lack of power. Sometimes it stutters when it loses power. Sometimes the engine keeps running when it loses power, but it just won't go.

It seems to be more likely to happen when the engine is warm, but I'm not 100% sure it matters. It'll stall at idle sometimes too if you restart it immediately after a stall and let it idle. Restarts are usually difficult after a stall.

I have a car that did this . Drove me crazy. Finally figured it out. Was vaper locking ,when it dies look into the carb and pump the throttle linkage. If no gas then its vapor locking. The fix for mine was to install a 4 psi inline electric pump . Still would hesitate when it's hot out after sitting in traffic.But has not done it since I switched to non ethanol gas. Ethanol has a much lower boiling point than gas.