![]() I didn't measure but it looks awfully close to the orifice size I see when I peer down the fuel filter. Another option is to retrofit the vehicle with an in-tank electric fuel pump. ![]() You might also consider covering the fuel lines and the carburetor in heat shields. The hard line steps up to a larger OD to accept 5/16" ID tubing, but appears to have a much smaller ID/orifice. For one, you'll want to make sure the fuel lines are routed away from the exhaust system and other hot components. I did notice yesterday that the stock 1/4" hard return line appears to have an orifice in it already where it would connect to the charcoal canister. At some point soon I'm going to replumb my fuel lines. My existing fuel filter is on the suction side of the pump. I'm looking to install the return filter because my charcoal can is long gone and I have the return line wide open and gas fumes are stinking up my garage. Piecing it all together, having the return filter behind the pump won't actually do much of anything since fuel under most conditions won't be heated enough (even under a mild suction) to cause much in the way of evaporation, at least not nearly as much as fuel after the pump (at 5-7 psi), picking up heat from the pump mechanism and absorbing heat from the engine. I got the pun! Thanks for the solid info. There are 3 sessions that may be helpful to you If this is your problem and you cant get it fixed right away, follow the fuel line up from the frame and look for it to be routed, again, near / onto something hot. 1972 Imperial & Chrysler Engine Performance Facts & Fixes Service Book (Session 291)įor 1973 specific info, scroll down Master Technician Service Conference - Chrysler's Training for Mechanics If the pressure has gone low and the fuel line is bolted to something hot like the water pump, for example, like it was on my 1968 307 Chevy Bel Air, the fuel will boil hence, vapor lock. ![]() Techs in '72 were reminded they could use the external bypass kit for cars without the special pump that had hot start flooding. Some car/engine combos got a special fuel pump with a small internal bypass. Tilt the filter up so it bups out like Chrysler started doing in '63 Carburetion and Performance Diagnosis (Session 188) from the Master Technician's Service ConferenceĬhanges in fuel, the need to run hotter idle temps, and the vapor controls sometimes called for additional measures. Plus, you can use excess material on other parts of the vehicle. In general, it’s the chosen method when trying to prevent vapor lock. This aftermarket accessory keeps heat away from the fuel lines and other fuel-related parts. Some vapor in the top of the fuel filter is normal, but should not fill the whole thing! Heat shields don’t cost a lot and can be simple to install. Click to expand.Read what Chrysler was telling their techs about vapor lock and fueling problems.
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