The Org - Serving W116 Enthusiasts since 2004!
Started by SteveDuNord, 04 May 2022, 10:57 AM
Quote from: Jan S on 30 June 2022, 05:30 PMYou can measure directly at the fuel pump, at the rear, under the car.Did you remove the tank cap when measuring return flow?I would also measure the flow at supply line to FD (to see if the filter, pipe, etc is clogged).Have you measured the system pressure? Should be in the range of 5-6 bar I believe ... please check exact spec.A few scenarios:1. fuel pump is ok but return flow is restricted due to a main pressure regulator that is not opening correctly (system pressure would be higher than 6 bar, I guess. The higher the pressure, the lower the flow)2. Main pressure regulator is ok but the fuel pump is not delivering the required flow (system pressure would be lower than 5 bar, I guess). Could also indicate a clogged fuel filter or pipeI believe you are facing one of the two ...Supply flow, return flow, system pressure and control pressure cold/warm are the first four things I would check.
Quote from: revilla on 01 July 2022, 12:59 AMHi,It seems like your mixture is off. I'd leave the pump and injectors aside for now. You have fuel going and your injectors even if not perfect would be enough to at least start the engine running rough. Weak pump and bad injectors/adaptors set would make your engine start even if rough. I would concentrate in the 3mm allen mixture screw that you played with.Follow the thread below to find a baseline where at least the engine starts. Then focus on fine tuning. You can add a few drops of fuel directly into the FD plate while someone else cranks the engine. You don't need to jump the relay, there's a much easier technic described in the post:Good luck.https://forum.w116.org/mechanicals/1979-280-se-not-running-on-fuel/msg153464/#msg153464
Quote from: revilla on 01 July 2022, 06:40 AMPerhaps your low fuel flow is related to the battery voltage being low (?)...When removing the injectors, perhaps you removed the distributor cap and/or cables to gain access to injectors 1/2 ? If yes, were them reinstalled in the correct order?I'm just guessing. Dropping a bit of fuel directly into de FD plate while cranking will give you an indication.Definitely do the plate slight depression test described in the post to confirm gas in coming in the right proportion through the injectors and you have spark. This is key for combustion. I would avoid touching other components until you set the mixture first, otherwise you might loose traceability of the changes and the engine will never start. I'm confident you will get there.
Quote from: gurrier on 01 July 2022, 09:17 AMThis is like a TV Serial - finishing on a happy ending. I preview of next season now provided.Thanks for the infotainment SteveDuNord.!!
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