2005 PORSCHE CAYENNE TURBO fuel pump

Maintenance, Car Care
251
Emergency unlocking
If the electrical release is faulty:
1. Open rear lid.
2. Remove lid of the right storage compartment.
3. Pull emergency release Ain the direction of
the arrow.
The filler flap pops open.
Refuelling
Danger!
The RF energy from a cellphone can cause a
sparking on bare metal, much like aluminium
foil in a microwave oven. The spark could ig-
nite gasoline fumes present while refuling.
Static discharge from your body can ignite
gasoline fumes present when you get back
out of the vehicle and touch the fuel nozzle.
In either case, resulting fire can cause seri-
ous damage to the vehicle, serious injury or
death to persons in immediate vicinity.
fDo not use a cellphone while pumping gas.
fDo not re-enter the vehicle while pumping gas.Total capacity approx. 26.4 gallons or
100 liters, including approx. 3 gallons or
12 liters reserve
1. Stop the engine and switch off the ignition.
2. Slowly unscw the tank cap.
Hang the tank cap on plastic strap A of the fill-
er flap.
3. Insert pump nozzle fully into the filler neck with
the handle of the pump nozzle facing down.
4. Do not add further fuel once the correctly op-
erated automatic pump nozzle has switched
off.
Fuel could spray or could run over when heat-
ed.
5. Replace the tank cap immediately after refuel-
ling and turn it until you hear it and feel it en-
gage.
Maintenance note
If you lose the tank filler cap, you must replace it
only with an original part.

252
Maintenance, Car Care
Fuel RecommendationsYour Porsche is equipped with catalytic convert-
ers and must use UNLEADED FUEL ONLY.
Your engine is designed to provide optimum per-
formance and fuel economy using unleaded premi-
um fuel with an octane rating of 98 RON
(93 CLC or AKI). Porsche therefore recom-
mends the use of these fuels in your vehicle.
Porsche also recognizes that these fuels may not
always be available. Be assured that your vehicle
will operate properly on unleaded premium fuels
with octane numbers of at least 95 RON
(90 CLC or AKI), since the engine's “Electronic
Oktane™ knock control“ will adapt the ignition tim-
ing, if necessary.
T h e u s e o f U N L E A D E D F U E L O N LY i s c r i t i c a l l y
important to the life of the catalytic convert-
ers. Deposits from leaded fuels will ruin the
converters and make it ineffective as an
emission control device.
Cars with catalytic converters have a smaller fuel
tank opening, and gas station pumps have smaller
nozzles. This will prevent accidental pumping of
leaded fuel into cars with catalytic converters.
Unleaded fuels may not be available outside the
continental U.S. and Canada. Therefore, we rec-
ommend you do not take your car to areas or
countries where unleaded fuel may not be avail-
able.
Octane ratingsOctane rating indicates a fuel's ability to resist det-
onation. Therefore, buying the correct octane gas
is important to prevent engine “damage“.
The RON octane rating is based on the research
method. The CLC (U.S. Cost of Living Council oc-
tane rating) or AKI (antiknockindex) octane rating
usually displayed on U.S. fuel pumps is calculated
as research octane number plus motor octane
number, divided by 2, that is written as:
The CLC or AKI octane rating is usually lower than
the RON rating:
For example: 95 RON equals 90 CLC or AKI
Fuels containing alcohol and etherSome areas of the U.S. require oxygenated fuels
during certain portions of the year. Oxygenated fu-
els are fuels which contain alcohols (such as meth-
anol or ethanol) or ether (such as MTBE).
Under normal conditions, the amount of these
compounds in the fuel will not affect driveability.
You may use oxygenated fuels in your Porsche,
provided the octane requirements for your vehicle
are met. We recommend, however, to change to a
different fuel or station if any of the following prob-
lems occur with your vehicle:
– Deterioration of driveability and performance.
– Substantially reduced fuel economy.
– Vapor lock and non-start problems, especially
at high altitude or at high temperature.
– Engine malfunction or stalling.
RON MON+
2 ----------------------------------
orRM+
2 ---------------

Practical Tips, Minor Repairs
311
Fuse assignment – fuse box in engine compartmentNote
Use the plastic grippers from the fuse boxes in the dashboard to replace the fuses.No. Designation Rating in A
1
Fan
60
2Fan30
3
Secondary air pump
40
4 Secondary air pump40
567
Fuel injectors, ignition coils
20
8 Fuel injectors, ignition coils20
9
Engine control units
30
10 Engine components: radiator fans, afterrun pump, carbon canister valve, AC pressure sensor, tank leakage diagnosis 10
11
Engine components
15
12 E-box relay, secondary air pumps, afterrun pump relay5
13
Fuel pump
15
14 Fuel pump15
15
Engine control unit, fuel pump
10
16 Vacuum pump30
17
Oxygen sensors
15
18 Oxygen sensors7,5