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Old 01-05-2016, 03:42 AM   #11
avanti
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Default Re: Espar D4 High Altitude Pump

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Originally Posted by GoJohnGo View Post
Seeing that the High Altitude Compensator is wired between the Heater Control Unit and the pump, my guess is that the Compensator is only modifying the duration of the pulse, not the frequency.
Just the opposite, I think. At least it isn't true as it modulates on startup:

http://sprinter-source.com/forum/showthread.php?t=9070

I am pretty sure that these dosing pumps are solenoid/diaphragm type. If so, they are insensitive to pulse width. That is why they are so precise.
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Old 01-05-2016, 04:13 AM   #12
vanski
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Default Re: Espar D4 High Altitude Pump

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Originally Posted by avanti View Post
Just the opposite, I think. At least it isn't true as it modulates on startup:

http://sprinter-source.com/forum/showthread.php?t=9070

I am pretty sure that these dosing pumps are solenoid/diaphragm type. If so, they are insensitive to pulse width. That is why they are so precise.
How did I not see this post! This is going to be much easier than I thought. Just need the time between all my different projects..

And yes, a pacemaker isn't too far off but it would be an almost certain death sentence
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Old 09-27-2018, 10:02 PM   #13
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Default Re: Espar D4 High Altitude Pump

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Originally Posted by vanski View Post
How did I not see this post! This is going to be much easier than I thought. Just need the time between all my different projects..

And yes, a pacemaker isn't too far off but it would be an almost certain death sentence
Hey vanski -- did you ever make headway with this project? Sorry for bumping all the Espar high altitude threads, but love all the ideas floating around and curious what has risen to the surface in 2018 :).
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Old 09-30-2018, 04:29 AM   #14
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Default Re: Espar D4 High Altitude Pump

I did extensive forum research years ago and conclusion was that just putting the HI-ALT pump in parallel (with e-switch) was the best solution. So I purchased the kit parts and all works fine but it was a hand-buster fitting those fuel lines together. In retrospect, since I don't travel in very cold weather, I should have just changed the pump.

AL
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