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Originally all Ponton carbureted models were fitted I further came to the conclusion that Mercedes doubtless knew of thisįuel evaporation from the Solex carburetors as an inherent problem, at leastĭuring the Ponton era. Of fuel in Europe at the time of design contributed to the evaporation. Maybe design steps related to the uneven quality Line and perhaps past the fuel pump valves towards the tank. Apparently fuel also drained down the fuel Of the Solex carburetors that Mercedes-Benz put on carbureted vehiclesĮvaporation from the float bowls after a period of time left no fuel in That the fundamental problem was in the design of at least some models Parts inside the engine that are worn (such that they no longer requireĪfter much consultation with Ponton experts and aficionados, I concluded The pump to lose its prime during extended shutoff periods), and (3) pump-driving Instead of 100-percent liquid gasoline into its inlet port but may also allow Hoses and corroded fuel lines (that not only make the pump draw some air Rate to go undetected until starting or hill-climbing problems are noted.Ĭonditions that can cause decreased fuel delivery rates include: (1) worn/defectiveįuel pumps (so they do not pump as well as they are supposed to), (2) cracked Uncommon for suction leaks and worn parts that decrease the fuel delivery On our Pontons, have large operating redundancies. Load at wide-open throttle, an engine needs much less fuel than the fuelĭelivery system is designed to provide. Some important additional considerations remain. ![]() Imprecise, admittedly, this test allowed me to look elsewhere I got a good spurt, quantity,Īnd flow of fuel. I "turned over" the engineĪnd directed the pump's output into the container. Over that port and the other end in a container. Next I detached the fuel lineįrom the outlet port of the pump. That the fuel delivery system was basically working, I stopped the car andĭisconnected the primary wire at the distributor so the car would not fire. Therefore, I checked if the non-priming fuel pump that was presently That is why the fuel pump output test is so great." 1 ![]() Properly, the cranking time will be lengthened (well beyond 10 seconds). IfĮither the fuel delivery system or the starting system is not functioning "e-start cranking time becomes a function of how quickly the engine'sįuel delivery and starting systems, working together, can add enough freshįuel to the carburetor fuel bowl(s) to allow the engine to start. Noting that the carburetor bowls are probably In a private communication I received some explanation that is so cogently That job produced no improvement in my case. Some, but not all, Pontons have this feature. Sometimes a hardened or disintegrating gasket can Previously I had cleaned out the housing of the fuel reserve device and Just fine, at least when the car was running at speed and at idle. Pump on my 1959 Mercedes-Benz Type 220S cabriolet seemed to be working I believed that, in general, the carburetor functioned decently becauseĪfter the engine starts, the car runs very nicely warm and cold, at idle The primary and secondary electrical systems were set to specifications. That is, to "correct" the problem, not just "fix" it. Ran for the fire extinguisher, fearing that the entire fuel system mightĮxplode (along with my house and pricey Mercedes-Benz cabriolet!).īefore I could aim the fire extinguisher, the flame died. The excess starting fluid, and perhaps some ![]() When I tried to start the car, flames shot out In my case, out of frustration, I stupidly squirted The starting fluid gambit is fraught with danger if you "Fixes" included pouring some gasoline or squirting some starting Putting the starter and battery at risk, the former occasioning domestic Much cursing and cranking were required - the latter These engines, after sitting unused for a few days,Ĭan be hard to start. My car was exhibiting the typical hard-starting problem reported by Would refittingĪn original lever-type, priming fuel pump help? If so, how and why?Ĭhose, as is my wont, to research the matter to death and beyond and write The fuel delivery system in my 1959 Mercedes-Benz Type 220S cabriolet was posing starting problems. Mercedes-Benz Ponton Fuel Pumps © Mercedes-Benz Ponton Fuel Pumps
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