Webasto thermotop C Installation Instructions Manual - Fuel Standpipe
Webasto Part Number : 4110310A
Issue No: 02 : 10th November 2010
Matthew Millard
In the interests of continued development, we reserve the right to change
specifications without prior notice
© Webasto Product UK Limited
Marine Comfort
When fitting the Webasto standpipe drill the fuel tank
using a “25mm” hole saw, or using a cone cutter in
preference to filing. Note: before drilling, grease the
top of the fuel tank around the intended drilling area to
collect any swarf which will be present.
Ensure that the aforementioned guidelines are referred
to when choosing the positions of components, such
as the heater and fuel pump.
Link the fuel supply from the standpipe to the fuel
pump and from the pump to the heater using the
copper Fuel pipe with the black hose sections as
unions as described previously. Remember to Flare
the copper pipe ends if any pipes have been
shortened. Remove any burrs from the Fuel pipe using
a small file and blow any swarf out of the pipes prior to
fitting.
Lay the fuel pipe straight, preferably running gently
upwards towards the heater to ease the bleeding of
any air in the fuel line. Avoid tight radius pipe bends as
these cause a resistance in fuel flow. It is preferable to
have a wide radius bend.
Securely clip the pipes at frequent intervals, away from
any heat source.
Please note if any other pipe fittings or inline Valves or
Filters etc are fitted into the fuel line that contain
compression fittings make sure they do not contain
brass olives as these are too brittle.
Only use copper olives. When using copper olives
there is less chance of distorting the copper pipe.
If the supplied standpipe is too long for the fuel tank
ascertain the correct length, (normally 4~5 inch from
tank bottom) then using a very sharp knife blade score
the pipe diameter and snap the excess off.
Ensure the standpipe is leak free after installation.
Webasto Standpipe
FUEL STANDPIPE
CONNECTION
It is possible to use instead of the Webasto standpipe
a piece of pipe that complies with the Webasto
standard of 5mm OD & 2mm ID. Below is a picture of
how this can be achieved using readily available parts.
A suitable hole needs to drilled to suit either a through
bulkhead connector or a weld in place threaded 'bush'.
If a bulkhead connector is used, use bonded washers,
(doubtless seals) between the metal of the tank and
the connector shoulder.
If it is decided to weld in a bush, make sure the male
insert has a tapered thread.
Thread a piece of pipe to the specification detailed
above through the fitting into the fuel tank.
Bend at 90 degrees taking care not to kink the pipe
and collapse the internal bore.
Tighten up the nut and olive to secure the connection.
Do not over tighten the fitting and crush the pipe.
A fuel resistant thread sealant must be used on both
options. Do not use PTFE tape!
Ensure the penetration into the fuel tank is leak free
afterwards.
Please ensure that the
pipe used complies with
the Webasto fuel pipe
standard of:
5mm OD
2mm ID
Use bonded washers on
the bulkhead connector.
Alternative Standpipe
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