Eberspacher (1 Viewer)

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jonH

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Oct 14, 2008
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I have just fitted an Eberspacher D2 night heater to my VW T4 camper and have a problem with the fuel supply. I inserted a 'T' piece into the fuel line which runs from the fuel tank to the fuel filter - the 'T' was inserted about 5cm from the filter - but the heater only operates for about 5-mins before it cuts out due to fuel starvation. I had a D2 heater fitted to my previous T4 about 3-years ago by an Eberspacher approved engineer and a similar problem occured and I can't remember how the problem was overcome although I recall that he may have fitted a non-return valve as a solution. I do remember him saying that the heater was only operating whilst there was fuel in the hose and once depleted was cutting out. Can anyone please offer me advice on how to overcome this problem?
 

dazzer

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Jul 30, 2007
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it could be that the fuel is pumped via an electric pump fitted to the tank. If the ignition is not on the pump will not run and you get zero fuel.

If this is the problem you will need to fit a new pipe inlet into the tank and draw fuel directly from the tank as the none functioning pump will be stopping fuel from flowing
 

American Dream

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Aug 20, 2007
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it could be that the fuel is pumped via an electric pump fitted to the tank. If the ignition is not on the pump will not run and you get zero fuel.

If this is the problem you will need to fit a new pipe inlet into the tank and draw fuel directly from the tank as the none functioning pump will be stopping fuel from flowing

Sounds good to me Dazzer.The same thing crossed my mind.:thumb:

Could the "t" piece be inserted before the fuel pump on the fuel tank side.Would the eberspacher draw the fuel by itself as you say.
 

Bulletguy

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Feb 7, 2008
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it could be that the fuel is pumped via an electric pump fitted to the tank. If the ignition is not on the pump will not run and you get zero fuel.
Almost definately the problem.

My van has a Webasto blown air heater and thats pumped independently of the ignition. Yes it uses diesel from the tank, but isn't pumped by the van pump.
 
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jonH

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Oct 14, 2008
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Thank you for all your replies. The engine is a 2.5tdi and I'm not sure that there is a fuel pump between the tank and the filter. I have used the same fuel line configuration as that installed in my previous camper - perhaps I need to bleed out an airlock that may have developed?

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monaco

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Jul 21, 2008
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Ebespatcher

Hi the D2 heater has its own 12volt inline fuel supply pump and ought to have its own pick up pipe in the fuel tank.
two reasons for this First is that when you tee into the fuel line you will pull fuel back from the engine supply line and then it will air lock
second is that the heater pick up pipe should be shorter than the main fuel pick up pipe or you could suck the tank dry useing the heater then the engine won't run

regards monaco
 
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jonH

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Oct 14, 2008
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My reason for wanting to tap into the fuel line is that it isn't going to be easy to fit a standpipe in the main fuel tank. A B Butt of Leicester realised this when I had a heater previously fitted by them to a VW T4 Transporter and somehow managed to tap into the fuel line from the tank to the fuel filter - they did experience a problem and I can't remember what modification they undertook, but it worked without a hitch. I photographed the installation that A B Butt did on my old van and it definetely shows that the heater fuel supply comes from the hose between the filter and tank.
 

American Dream

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Hi the D2 heater has its own 12volt inline fuel supply pump and ought to have its own pick up pipe in the fuel tank.
two reasons for this First is that when you tee into the fuel line you will pull fuel back from the engine supply line and then it will air lock
second is that the heater pick up pipe should be shorter than the main fuel pick up pipe or you could suck the tank dry useing the heater then the engine won't run

regards monaco

A very valid point being made here.Similar to the fuel supply to an on-board genny.You could end up with an empty fuel tank.
 
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jonH

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Oct 14, 2008
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Point taken regarding the possibility of running out of engine fuel but quite honestly we only have the heater running occasionally and being a small camper it's only consuming approx. 1-litre for 10-hrs of running so I'm unlikely to be caught short of fuel. I've noticed this NRV on eBay: Link Removed and wondered whether the problem of sucking fuel from the engine side of the fuel supply line could be easily overcome by fitting it between the 'T' draw off and the filter?
 

American Dream

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Aug 20, 2007
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Point taken regarding the possibility of running out of engine fuel but quite honestly we only have the heater running occasionally and being a small camper it's only consuming approx. 1-litre for 10-hrs of running so I'm unlikely to be caught short of fuel. I've noticed this NRV on eBay: Link Removed and wondered whether the problem of sucking fuel from the engine side of the fuel supply line could be easily overcome by fitting it between the 'T' draw off and the filter?

Sounds like being a very good solution and,at that price, well worth a try.

4e74_2.JPG


Non Return (one-way) In-Line Fuel Valve
Aluminium construction - Heavy duty
suits 8mm fuel hose

Stop fuel syphoning back down the pipe. Holds the fuel in the pipe to stop air entering.
Suitable for Carbs and low pressure fuel systems
all fuels including Petrol / Diesel / Bio / Veg Oil / Paraffin, etc

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jonH

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Oct 14, 2008
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I fitted the NRV today and all seems well. Thank you to all who contributed.
 
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danw1020

Deleted User
same problem

I have the same problem - t4 2.5 tdi - teed into the fuel line in the same place as you and fitted a one way v/v in line to the eberspacher supply near the T. Is this where you fitted your one? Mine still gets airlocks! Dan
 

Tony Lee

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Sep 28, 2008
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Some diesel motor systems have a fuel supply line drawing from the bottom of the tank and a fuel return line returning fuel to the top of the tank so if you tap into the wrong one, you will soon run out of fuel
 

pappajohn

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Aug 26, 2007
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I have the same problem - t4 2.5 tdi - teed into the fuel line in the same place as you and fitted a one way v/v in line to the eberspacher supply near the T. Is this where you fitted your one? Mine still gets airlocks! Dan

it goes between the 'T' piece and the engine.

also get it the right way round or it will cut all fuel to the engine:Eeek:

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McG

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Oct 6, 2009
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Eberspacher D2 only idling.

Hi guys, this is my first post to your forum and it looks like there's some good ideas around.:thumb:
I fitted 2 D2 Airtronics to my motorhome. Both start up fine but only run for 2 to 3 minutes at full speed and then dropp off to a mere idle. Sometimes they would pick up speed again for a minute or two and the revert to slowmo again :Angry:. Any ideas will be highly appretiated.

Just some more info: The one is running off the 801 controller and the other is on a 7day timer. The temp is set to 32degrees (max). Temp in bus is approx 19 degrees.
 
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Douglas

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Aug 22, 2008
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If I remember correctly from the last time I fitted a Eberspacher, it specificly says in the fitting instrructions that the unit should have its own supply direct from the tank, it does not say why.

Doug...
 

Wildman

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Why on earth are you not running off a seperate tank, you could use red diesel or central heating fuel then at half the cost. As to your problem sounds like you may have a faulty/incorrect fuel pump.
 

McG

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Oct 6, 2009
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If I remember correctly from the last time I fitted a Eberspacher, it specificly says in the fitting instrructions that the unit should have its own supply direct from the tank, it does not say why.

Doug...

Hi Doug, I did a test with mine. The heater uses so little fuel that if you have the fuel line connected to any other pipe that may have some air in it, you find that the heater fuel pump cannot get rid of the air. By the time the fuel enters the thin heater fuel line, the heater has already shut down due to fuel starvation One way valve should solve it. I am running both directly from the fuel tank. My 2cents worth :Sad:.
 

McG

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Oct 6, 2009
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Why on earth are you not running off a seperate tank, you could use red diesel or central heating fuel then at half the cost. As to your problem sounds like you may have a faulty/incorrect fuel pump.

Thanks Wildman, but I've tried another fuel pump already. Can you guys tell me the diameter and type of ducting you're using? I have the idea that it has got something to do with overheating...

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