On some old collectible vehicles, the fuel line routing may be “Zeed” through the frame rail. If it’s kinked, replace the fuel line with steel tubing and smooth bends away from exhaust heat sources. Inspect the fuel line all the way up to the pump. Make sure the fuel pickup tube inside the tank is not cracked. And have a fire extinguisher nearby, just in case.Ĭhains and rocks usually are inadequate for cleaning. Some older tank systems are vented with a notch in the filler tube and are fitted with a sealed cap.įor safety’s sake during fuel tank repairs, place the vehicle outside of buildings. As you may know, most tanks are vented in the cap. Have the tank cleaned and repaired professionally. Inspect the tank for excess debris (rust and dried-up gummy junk). Will an electric pump help out in a mechanical-pump fuel supply system? Maybe it will help but in my experience, more often you may be covering up other fuel supply problems instead of discovering the real causes of fuel supply failures.įirst, inspect the entire fuel line and tank for cleanliness. Replace with steel fuel lines and fittings.
#Gas vapor lock crack
Copper fuel lines work harden, become brittle and crack due to engine vibration. If manifold vacuum does not improve, your only choice then is to perform a valve job and remove the carbon. So drive the car and re-measure the manifold vacuum as discussed earlier in the “Exhaust Plugging” section. In these cases I would try a carbon remover product to “clean it out.”īeware, in extreme cases this treatment may not work. After driving 15 or 20 miles, the engine smoothed up and “ran strong” during wide open throttle acceleration.Īpparently carbon buildup on the valves was the cause for the lack of performance and could lead to block overheating. Then on the road under cruising and moderate engine loads (10-18” vacuum) at 40-50 mph, the engine would run very rough. These engines would idle smooth and rev up to 1500 rpm in neutral. I have tested engines that had good even compression during cranking. Last month’s installment had 11 images, so we’ll start here with Photo 12.Īfter setting for many years (10-20) carbon buildup around valve tulips and stem areas can cause the valves to stick during road operation. This time we’ll look at more potential sources to check and fix if your vehicle’s still not running right.
We Covered Several Last Time and Here are Some More.ĮDITOR’S NOTE: LAST month we discussed some of the causes for vapor lock and covered details of a good tune-up and cooling system servicing to help fight the problem. Ma| By Milt Webb There are Many Causes and Fixes for These Common Problems.
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