FIP Check

[JJ65SL]

Many thanks to all who have provided valuable information to me as I strive to perform many of the necessary maintenance items on my 65 230 SL. 

In order to determine if the FIP is providing fuel to the injectors, which are new, I have followed the advice provided by Joe Alexander in a previous post. I removed the plugs and disconnected the fuel lines at the injectors. Fuel is exiting the fuel lines. The fuel appears to be exiting in a pulsating manner. How strong should the fuel flow be, given that the lines are open?

Thanks,

John

[ja17]

Fuel emerging from the IP is a very small quantity with low rpms during cranking. More throttle, colder temperatures and higher rpms will increase the quantity. I am not sure what the pressure of the fuel exiting the IP injector lines but the gasoline injectors open around 40 lbs I believe. Be sure that the fittings on the IP are torqued to specs. If they are too loose fuel will not emerge from the fittings. Don't over-torque them or you can actually crack the aluminum pump housing.

[JJ65SL]

Joe, thank you very much for your reply. Based on your comment and the amount of fuel exiting the opened fuel lines at the injectors while cranking, I think the FIP is working properly. Now I need to figure out why the engine won’t start, even though there is spark, new plugs, linkage is properly set, new OEM fuel tank, fuel filter and most recently a Pertronix II Igniter and Flamethrower II. There has been some mild backfiring at start attempts. Any comments would be greatly appreciated. 

John

[ja17]

A lot of cranking is required to fill and prime those long injector lines. Remove all the spark plugs, loosen the injector lines at the injectors and crank the engine at full throttle until fuel emerges from each loose line,
at each injector. Tighten each line when fuel emerges. When all six lines are primed and tightened, re-install the spark plugs and the engine will start!

[JJ65SL]

Joe, thanks for the additional pointers.  I have been traveling for over a week and just got back to trying to get the car started.  First, I checked to make sure the intake start valve was functioning and it is spraying into the intake manifold as it should.  The fuel supply to it is very strong.  I primed the fuel lines to the injectors as you suggested and tightened them to the injectors at the appropriate torque.  After installing the plugs, I tried to start it but I am only able to get an occasional backfire.  Any further suggestions would be greatly appreciated.

John

[Kevkeller]

Did you move the distributor and knock the timing out?

[Pawel66]

Very similar though as Kevkeller. Or: have you been removing ignition leads? Are they in proper order on the distributor?

Also: after prolonged cranking with no start - are the spark plugs wet and smelling gas? Or rather dry?

Last one - timing of the FIP, but even with the timing off 180degree, the engine should work. So rather ignition topics, I would think, are to be checked.