Aux water pump..what works best

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fryersam's picture
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Joined: 08/22/2008

86 MB 300,  GC 2 tank,low veg temp. I have an 85C stat. and operating temp is about 85C
previously veg temp was about 165 ish, now 140 ish. flushed veg loop with a drill pump (hphe to tank coil to filter coil) pinched off heater loop. line seems clean and good flow with drill pump.
thinking a aux pump may help. what pumps work well and last? are the MB pumps the best? I see they come with a plug, is there a place already on the car to plug it in or do I cut it off and make a sep. circuit for it
the MB aux water pump range from $80-200 any diff in quality?
should I be looking somewhere else?

veggpwr's picture
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Joined: 09/27/2010

The MB gentlemen would chime in about your concern about the aux coolant pump.
 
But previously veg temp was about 165 ish, now 140 ish. Why it drops???
There is a thread here recently about low veggie temp and found the feed valve "A" not fully functional
because of defective relay module. It fed veggie and diesel at the same time.
I would check for sticking valves and make sure there is battery voltage and good gound at the solenoid at veggie mode.
 
Edit:
It could be bad coolant circulation in the veggie coolant loop due to air in the loop.

__________________

'05 Cummins CTD 24V HPCR RAM 2500 QC SLT SB Black 4X4 48RE  325 hp  610 ft.lbs
GC Kit  + 3rd Tank WVO(80%)/RUG(20-30%)  +  Co-Pilot 
3-Tank Operation managed by Co-Pilot: Blending(warm up) / Veggie(hot run) / Diesel(purge for next start)
Smarty Jr  40/70/100 hp (Timing Map Modification)
 

fryersam's picture
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Joined: 08/22/2008

Veggpwr, thanks for the reply.  the valves seem to be working properly.
the veg coolant loop seems to flow real good under pressure from the drill operated pump. however when I checked for temps with infrared temp gauge I found that at the tee, located passenger side, temp is 175 as I move towards the drivers side it get cooler.
the fphe located behind drivers side headlight, long run, is 140ish. thats why I'm thinking aux pump.  other than a long drive, any way  to purge loop?
been driving over 4 years on veg and temp never get over 175 even in summer.  I'd like to get them temp up higher, what do you think?
Sam
 
 
 
 

veggpwr's picture
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Joined: 09/27/2010

Again why it drops from 165F to 140F with the same setup???
IMO this is an issue. I would try to figure this out first then add the aux pump.
 
If you have NO RESTRICTION in the veggie coolant loop an aux coolant pump would help to bring up
the veggie temp faster and higher.
In summer your final veggie temp would approach closely (0-5 degrees difference) to your coolant temp.
In winter there would be a 15-20 degrees difference, depends on the ambient temp.
 
Insulation on the coolant hoses and the veggie fuel line will help too.

__________________

'05 Cummins CTD 24V HPCR RAM 2500 QC SLT SB Black 4X4 48RE  325 hp  610 ft.lbs
GC Kit  + 3rd Tank WVO(80%)/RUG(20-30%)  +  Co-Pilot 
3-Tank Operation managed by Co-Pilot: Blending(warm up) / Veggie(hot run) / Diesel(purge for next start)
Smarty Jr  40/70/100 hp (Timing Map Modification)
 

fryersam's picture
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Joined: 08/22/2008

anyone install an aux pump on a MB, what has your exp. been? 
where is the best place to install?
what make/model works best?  your observations are welcome.
thanks for your help