Page 48 of Volkswagen Parts by PartsPlace Inc.

e t ch t ip daily driver section hot start problem new fuel pressure accumulator all rabbit® scirocco® jettas® dashers® golfs® quantum® audis® etc from `77 through approximately `88 have cis fuel injection continuous injection one of their classic problems is hot starting after you turn off the car the heat from the engine and exhaust pipe soaks into the injectors and injection lines and boils the gas into vapor then you have vapor lock it s kind of backwards vapor lock because vapor lock is usually an air space in the line between the fuel tank and the pump and the pump can t suck a vacuum so it spins in the air vapor and you sit there and grind and grind and go no place bosch installed a number of solutions to this problem one of which was the fuel pressure accumulator the fuel pressure accumulator is like an orange juice can with a big spring and rubber diaphragm when the pump is turned on the fuel pump pressure compresses the spring fills the accumulator with liquid gas and holds this pressure when the pump is turned on this reserve tank of pressurized fuel keeps constant pressure on the fuel at about 50 pounds and as you remember from your high school physics class that you slept through a pressurized liquid be it water/steam or gas/vapor boils at a much higher temperature if its pressurized therefore it won t boil in the lines and stays liquid and your pump is able to pump it and pressurize the fuel in your system to allow your injectors to overcome their internal pressure valve in operating as you know the cis injectors have a pressure valve in them which keeps them from leaking and dripping fuel into the cylinder when the engine is off but this check valve will not open to the pressure of fuel vapor and therefore will not open and let you start if the fuel has vaporized due to the low pressure caused by a faulty accumulator accumulators fail externally and internally in all volkswagen® applications the fuel accumulator sits under the rear passenger side seat and it is exposed to salt and external corrosion many older cars in the salt areas develop leaks due to external rust through of the fuel accumulator this is usually very easy spot by the puddle of gas under the car check out your rusty accumulator in advance because it s not cool to drive down the street with gas from a pin hole in an accumulator spraying on a nice hot muffler you don t want to look like one of those fake car crashes in movies where everything burns up defect number two is internal the internal diaphragm springs a leak and the accumulator gets water logged with gas on both sides of the diaphragm and is less effective this is more common when the accumulator is not working it contributes to the hot start problem if you have a hot start problem the very first thing you should probably do is replace the rubber o rings on the injectors as they only cost about a buck a piece this causes vacuum loss so the throttle plate doesn t lift so no start a different problem but common is your accumulator holding the pressure when your car is parked hot we bought a buy out of new late model fuel accumulators which can be used for all volkswagen® applications they are the latest design and brand new they are a little smaller than the ones used originally with the early rabbits® and jettas® but they hold a slightly higher pressure and work extremely well with tired systems they are shipped with a rubber sleeve which is only needed on the earlier units to make them fit in the older brackets discard this rubber sleeve if it is not needed if it is needed just install the new fuel accumulator with the rubber sleeve on it in the old bracket in the original location using all the original hoses etc which will mount up to it exactly hope this solves your hot start problem fuel pressure accumulator dealer #sn14153 accumulator new #sn3509 cis injector puller us 129.95 60.00 7.95 189.06 13 95 #sn30502 accumulator used injection o rings kits sold each golf®/jetta® fox® `88-96 with digifant electronic injectors #sn16017 5.95 golf®/jetta® fox®,quantum `85-92 all without electronic injectors cis type #sn15566 3.50 passat® `90-93 2.0 g/j 2.0l 16v #sn15560 3.50 rabbit®,scirocco® jetta® `77-84 kit for entire car #sn16018 .8.95 includes holders and seals new at partsplace fuel pressure gauge kit we now have a fuel-pressure gauge kit to test your fuel pressure and to diagnose what is wrong with your car this is an absolutely complete kit easy to use and designed to work with the cis and cis-e fuel systems found on most vws® you can test your fuel pump fuel distributor warm-up regulator diff pressure regulator etc we are in the process of offering fittings so these can be used with every vw® fuel system ever made #sn15577 fuel pressure gauge kit 119.95 i take your tech calls day in and day out and i ve noticed most drivability problems vw® owners are having involve problems with their car s fuel system i try to help you over the phone but without actually testing the car out and being there it is very difficult however when someone calls me with fuel-pressure readings it makes it a lot easier this fuel-pressure gauge kit we now sell is an indispensable tool in the vw® owner s toolbox many times i tell people to take their car to a shop and have the fuel pressure tested this usually costs $100-150 and once it s done what do you have our gauge costs $139.95 snapon s cost is $320 and you can use it over and over again as if you were a professional mechanic it s also usa-made and i know a lot of you have more than one vw® believe me this tool will save you lots of time and money i have this exact tool at home and use it all the time tech tip p-48 partsplace inc 2300 n opdyke 248 373-2300 auburn hills mi 48326 fax 248 373-5950

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