![]() ![]() How did you get on with this in the end? I have a very similar problem with my 1984 99GL – but I also don't have the plastic swirl pot fitted to my carb. YOU CAN ALSO SEE,THEY ALSO HAD AN 'INSULATING' BLOCK,FROM CARB TO INLET MANIFOLD,MAYBE 10MM THICK,WHICH DETORIATED/CRACKED OVER TIME. THE VERY LAST OF THE N/A 90/99/C900 HAD I THINK 'PIERBURG' CARBS,ALTHOUGH I SUSPECT THIS WAS TO MEET 'EMISSION' REGULATIONS? PICTURE HERE TRY PULLING OFF THE SINGLE WIRE TO IT,WHEN THE CAR WON'T START? THERE IS ALSO A SMALL 'SOLENOID' VALVE FITTED,ON THE BOTTOM OF THE LATER STROMBERG WHICH SHOULD SHUT OFF THE FUEL SUPPLY,TO PREVENT 'RUNNING ON',WHEN THE ENGINE IS SWITCHED OFF. WHEN THE PUMP BECOMES WORN,ENGINE OIL DRIPS DOWN,THE ENGINE BLOCK,FROM THESE HOLES.ĪS '99 PETE' SAYS,THE LITTLE PLASTIC SWIRL POT KIT,WAS FITTED TO THE LATER STROMBERG EQUIPPED CARS,I THINK 84-85. THIS IS USUALLY CAUSED BY THE(ORIGINAL) FUEL PUMP,WHICH HAS SMALL HOLES PUNCHED IN THE BACKPLATE ON 'H'SERIES(B201). INCIDENTALLY, FOR OUR READERS BENEFIT? AN 'ELUSIVE' ENGINE OIL LEAK,DOWN THE SIDE OF THE NEARSIDE FRONT ENGINE BLOCK,AROUND CYLINDER HEAD HEIGHT? THIS CAN BE CHECKED BY REMOVING THE PLASTIC INTAKE PIPE,AND FEELING INSIDE THE STROMBERG WITH A FINGER,OR SHINING A TORCH,WHEN THE ENGINE IS HOT.THE VARNISH CAN BE CLEANED OFF CAREFULLY WITH SOME P1500 WET AND DRY,USING WD40 TO LUBRICATE THE P1500,WHILST THE DIAPHRAGM IS BEING REPLACED. THE ENGINE THEN FLOODS,AND WILL NOT START. OTHER ISSUES I HAVE EXPERIENCED,WHEN THE ENGINE IS HOT,CAN BE CAUSED BY CARBON/VARNISH BUILD UP ON THE OUTSIDE OF THE ALLOY PISTON,INSIDE THE CARB, MAKING IT STICK IN THE 'OPEN' POSITION. IT MAY ONLY RUNS FOR 4-5 SECS,OR THIS MAY BE ENOUGH TO 'FOOL' IT,AND KEEP IT RUNNING. IF IT STARTS IMMEDIATELY,THEN ITS DOWN TO FUEL/EVAPOURATION. REMOVE THE BRAKE SERVO RUBBER PIPE FROM THE TOP OF THE INLET MANIFOLD,POUR HALF AN 'EGG CUP' OF FUEL INTO THE INLET MANIFOLD VIA RUBBER GROMMET IN THE TOP OF THE MANIFOLD(SMALL FUNNEL HELPS) REPLACE SERVO RUBBER PIPE,AND CRANK THE ENGINE. IF IT STILL DOES THIS,AFTER A NEW FUEL PUMP AND DIAPHRAGM?ĬARRY HALF A GALLON OF FUEL AROUND(IN A PETROL CAN,WITH LONG NOZZLE) FOR WHEN THE CAR STOPS/BREAKS DOWN NEXT? YEP,IN LINE FUEL FILTER(CLEAR PLASTIC) IS ALWAYS A GOOD IDEA.THAT WAY YOU AN SEE WHAT'S HAPPENING,WITHOUT HAVING TO REMOVE THE FUEL LINE,ESPECIALLY WHEN IT'S HOT. Detereorating hoses can leak air into the fuel system on the suck side of the fuel pump or cause a loss of pressure on the carb side without actually showing signs of leaks. Electric pump at the back is way forward for me here but not suggesting this is the best solution for your 99.Īs Birdie suggested start off by just making sure what you've got is in good condition, just replacing all the fuel pipes and fitting new clips might help. ![]() I put it down to inferior valves in the new pump which just couldn't handle higher temps. ![]() Wasn't a problem before and wasn't a problem after I changed back to the original FoMoCo (Pierburg?) pump. ![]() I changed the fuel pump on my Sonett and the engine would just conk out in hot weather when stuck in traffic. Something else to consider is the fuel pump. Unlikely I know but just thinking if you are still on a tank of 'winter' fuel? With all cars fuel injection now this might not even apply now. Same report also suggested that additives used to be added in summer months to make the fuel less volatile in the hot weather. Try different brands and grades of fuel, I think I read a report somewhere that proved some fuel on the market is more volatile than others. Saab used to market a retrofit kit to fit this system to earlier cars. If it has it might be worth checking it is all plumbed in correctly and does not have any blockages in the return line. 99's & 900's had a little plastic swirl pot and a return line to the fuel tank.įuel vapour would get seperated out in the swirl pot and sent back to the fuel tank. Not a problem if the fuel is pressurised to around 45 PSI on an injection car. Vapour lock was starting to become a problem even back in the day when the last of the 99's were new.įuel was getting more volatile at around the same time that unleaded petrol was coming on the market. ![]()
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