Auburn Hills, MI 48326
Fax: (248) 373-5950
2300 N. Opdyke
(248) 373-2300
PartsPlace
inc.
R-48
All Rabbit
®
, Scirocco
®
, Jettas
®
, Dashers
®
, Golfs
®
, Quantum
®
, Audis
®
, etc. from ‘77 through approximately ‘88 have CIS fuel injec-
tion (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 back-
wards 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 pressur-
ize 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 cor-
rosion. 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.)
T
e
c
h
T
i
p
HOT START PROBLEM.
N
N
E
E
W
W
F
F
U
U
E
E
L
L
P
P
R
R
E
E
S
S
S
S
U
U
R
R
E
E
A
A
C
C
C
C
U
U
M
M
U
U
L
L
A
A
T
T
O
O
R
R
!
!
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!
Is your accumulator holding the pressure when your car is parked hot.
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.)
#SN155
77
Fuel Pressure Gauge Kit
$
119.
9 5
TECH TIP:
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 some-
one 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 (Snap-on’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!
New at
PartsPlace!!
Fuel Pressure Accumulator
DEALER
US
#SN14153
Accumulator NEW
. . . . . . . . . . . . . . . . . . . . . . . . . .
189.
0 6
129.
95
#SN30502
Accumulator (used)
. . . . . . . . . . . . . . . . . . . .
60.
00
#SN3509
CIS Injector Puller
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
13.
9 5
7.
95
1 CIS 1.6/1.7 ‘77-84
A. O-ring
#SN1443 . . . . . . . . . 1.
2 5
B. Insulator
#SN1441 . . . . . . . . . .1.
2 5
2 CIS 1.8 w/ air-shrouded injector (‘83-84 only)
A. O-ring
#SN1443 . . . . . . . . . .1.
2 5
B. Insulator
#SN1442 . . . . . . . . . .1.
7 5
3 CIS/CIS-E w/ air-shrouded injector (‘85-92 only)
A. O-ring Kit
#SN15566 . . . . . . . . .3.
5 0
B. Upper Insulator
#SN5018 . . . . . . . . .7.
8 5
C. Lower Insulator
#SN5020 . . . . . . . . .1.
2 5
4 Digifant/Motronic Injector (‘88-92 8V) (‘93-03 all)
A. O-ring Kit
#SN16017 . . . . . . . .6.
9 5
Injector O-rings & Insulators 1977-99.5
1
A
B
2
A
B
{
3
A
B
A
C
{
A
4
