Bluemoon Posted December 9, 2012 Share Posted December 9, 2012 do you have to use a webasto fuel pump for webasto heaters , or can you use a generic fuel pump, the cost of webasto fuel pumps lately is short of criminal, I know they are dosing pumps, but are there any suitable other pumps out there, cheers for any info in advance. Brian Quote Link to comment Share on other sites More sharing options...
MECCANO Posted December 10, 2012 Share Posted December 10, 2012 unfortunately not, they work on a single pulse from the controller stroking the solenoid. if you apply 12v to the pumps they just pump once and doesnt return until the voltage is removed. Hopefully that makes some sense. Quote Link to comment Share on other sites More sharing options...
miketomcat Posted December 10, 2012 Share Posted December 10, 2012 You maybe able to use an eberspacher pump but I would check with a dealer or specialist. Mike Quote Link to comment Share on other sites More sharing options...
Bluemoon Posted December 10, 2012 Author Share Posted December 10, 2012 I was told you could add a "flasher" relay into the mix, just wondering if anyone had tried Quote Link to comment Share on other sites More sharing options...
Giles Posted December 11, 2012 Share Posted December 11, 2012 you can use a flasher relay to prime the espar/webasto where the tank is too distant, i.e. if it fails safe (lack of fuel) before igniting. Never tried running it like that tho...hth Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted December 11, 2012 Share Posted December 11, 2012 I don't understand Meccano's comment - both Webasto & Eberspacher are dosing and work on "one pulse = one squirt of X millilitres of fuel". Both will probably tell you in the manual how much it is per squirt, I suspect going for a different pump that gives the wrong amount would lead to problems as the heater has no good way of knowing how well things are burning. On the flipside, any pump that delivers X ml of fuel for one 12v pulse should work as long as the amount is right. Using a normal (constant delivery) fuel pump would be rather tricky unless you pressurized a line & then let "squirts" past using a solenoid or EFI fuel injector. Seems more hassle than it's worth though. Quote Link to comment Share on other sites More sharing options...
rovernut Posted December 11, 2012 Share Posted December 11, 2012 Not too sure about the Webasto but the most delicate part of either system is the ECU (very expensive) and as this delivers the pulses to the pump, I wouldn't mess with alternatives. Quote Link to comment Share on other sites More sharing options...
JST Posted December 12, 2012 Share Posted December 12, 2012 rover 75 or similar has them, Marcus picked one up from a scrappy for £15. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted December 12, 2012 Share Posted December 12, 2012 Freelander 1 TD/TD4 has them, Disco 2/3/4 have them, VW Sharan / Ford Galaxy, BMW 5's and probably others, various Rovers. Quote Link to comment Share on other sites More sharing options...
HoSS Posted December 12, 2012 Share Posted December 12, 2012 flasher relay may work for priming, but definitely will not for operation. The pulses are modulated by the ECU in operation. Quote Link to comment Share on other sites More sharing options...
MECCANO Posted December 13, 2012 Share Posted December 13, 2012 Fridge... Good luck finding those values in a manual. Webato and Eberspacher don't broadcast it. I was refering to the comment of a generic fuel pump... aka a continous flow car pump. Which you can't just connect up instead. Yes if you know the value you could replicate it, and build a circuit to drive a contious pump in a pulse mode. or lash something up with an injector etc.. but continually dosing the thing with too much or even too little fuel and you will send it into a fault mode. Which then means buying more kit to clear that.... when you can pick up a correct pump for £25-30 Also an eberspacher or webasto will only stroke once until the voltage is release.A generic pump may deliver multiple squirts in that pulse width duration. Also webasto and eberspacher aren't easily interchangable... a webasto 3kw pump has a completely different flow rate to an eberspacher of the same kw rating. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted December 13, 2012 Share Posted December 13, 2012 Fridge... Good luck finding those values in a manual. Webato and Eberspacher don't broadcast it. Page 35: http://www.disco3.co.uk/gallery/albums/userpics/10700/Disco_3_FBH_Workshop_Manual_Thermo_Top_V.pdf Quote Link to comment Share on other sites More sharing options...
MECCANO Posted December 13, 2012 Share Posted December 13, 2012 Owned Okay Eberspacher are a pain in the ..... Blue Moon What webasto do you have? I think if you were to use a continous pump, you are best running it as its intended, with a slightly restrictive return. Then tapping off the circuit with a solenoid valve ( operated by the heater) and a bleed valve to trim it in to the correct flow using the values in the above manual. Actually scrap that, put the bleed valve in the return, and you effectively have an injection setup. I think this is how the larger Night heaters work (+10kw) Quote Link to comment Share on other sites More sharing options...
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