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26-04-2023, 18:28
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#1
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Registered User
Join Date: Apr 2023
Location: Norway
Boat: Viksund Goldfish 31 feet
Posts: 25
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Diesel heater fuel pump placement
Hi!
It's my first time installing a diesel heater and I struggle a little bit with the placement of the fuel pump.
Here's two pictures.
The first one is the setup with a mikuni that was already broken when I bought the boat.
The second picture is what I assume is a better install for a new one?
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26-04-2023, 19:12
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#2
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Moderator
Join Date: Feb 2010
Location: Australia
Posts: 3,402
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Re: Diesel heater fuel pump placement
I got a Planar heater for my boat and the pump is very fussy about how its installed, also, its a metering pump so only clicks every now and then.... not continuously like an engine fuel pump. The fuel line is usually transparent which allows you to see bubbles in the flow[ATTACH]
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26-04-2023, 19:33
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#3
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Registered User
Join Date: Jan 2020
Location: Cailifornia
Boat: 1999 Hunter 410
Posts: 158
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Re: Diesel heater fuel pump placement
2nd photo is the way to go.
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26-04-2023, 19:53
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#4
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Registered User
Join Date: Apr 2023
Location: Norway
Boat: Viksund Goldfish 31 feet
Posts: 25
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Re: Diesel heater fuel pump placement
Quote:
Originally Posted by Windpilot
2nd photo is the way to go.
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Thanks!
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26-04-2023, 20:19
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#5
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Registered User
Join Date: Oct 2016
Location: Vancouver Island
Boat: Hullmaster 27
Posts: 1,047
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Re: Diesel heater fuel pump placement
definitely the second ... you do not want a high spot in the line after the pump where air bubbles can accumulate.
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26-04-2023, 20:57
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#6
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Registered User
Join Date: Apr 2023
Location: Norway
Boat: Viksund Goldfish 31 feet
Posts: 25
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Re: Diesel heater fuel pump placement
Quote:
Originally Posted by Kelkara
definitely the second ... you do not want a high spot in the line after the pump where air bubbles can accumulate.
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Yeah..
I tried to troubleshoot the old Mikuni system that was set up as in the first pic, but I quickly found out the pump was toasted. What you're saying probably explains why.
Hopefully it's gonna work out setting up the new heater with the pump below the diesel tank so the siphon effect helps out.
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27-04-2023, 07:42
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#7
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Registered User
Join Date: Apr 2013
Location: Penobscot Bay, Maine
Boat: Tayana 47
Posts: 2,124
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Re: Diesel heater fuel pump placement
Quote:
Originally Posted by skipperpete
I got a Planar heater for my boat and the pump is very fussy about how its installed, also, its a metering pump so only clicks every now and then.... not continuously like an engine fuel pump. The fuel line is usually transparent which allows you to see bubbles in the flow[ATTACH]
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I’ve installed a Webasto and a Espar and in both installations the instructions stressed that it was important to use a solid fuel line so the pulses of fuel are transmitted to the heater rather than being partially absorbed by the elasticity of soft sided hoses. I agree it would be useful to see any bubbles in the line to assist in troubleshooting problems but I think I’d limit the use of clear hose to something like an inch to avoid diminishing the intensity of the pulses of fuel that the unit depends on to work correctly. There’s presumably a reason why all these units use a pulse pump rather than a pump that applies a steady pressure such as those found in most other applications.
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27-04-2023, 08:46
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#8
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Registered User
Join Date: Oct 2016
Location: Vancouver Island
Boat: Hullmaster 27
Posts: 1,047
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Re: Diesel heater fuel pump placement
my chinese heater came with a rigid hose that was translucent enough to see bubbles ...
This guy does a good job explaining how to set them up and why:
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27-04-2023, 09:31
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#9
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Registered User
Join Date: Oct 2010
Location: Southeastern Alaska and Guatemala, Rio Dulce
Boat: 40 foot Schucker motorsailer and 46 foot Ted Brewer custom
Posts: 254
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Re: Diesel heater fuel pump placement
My Dickinson heater wants the fuel pump installed higher than the heater. Fuel pumps are good at pulling and not good at pushing. Better get it right.
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27-04-2023, 10:02
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#10
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Senior Cruiser
Join Date: Dec 2012
Location: Olympia WA
Boat: Cascade 36
Posts: 104
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Re: Diesel heater fuel pump placement
I installed an Espar hydronic furnace where the fuel dosing pump is built into the furnace housing.
I found it useful to include a small ball valve in the fuel supply line from the tank pick-up. The valve is closed when the furnace is not in use or when the furnace must be disconnected from the fuel line for service. This helps to maintain a prime in the fuel supply and reduce the need to bleed air from the line.
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27-04-2023, 13:20
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#11
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Registered User
Join Date: May 2021
Posts: 185
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Re: Diesel heater fuel pump placement
Quote:
Originally Posted by SailorJoJo
Hi!
It's my first time installing a diesel heater and I struggle a little bit with the placement of the fuel pump.
Here's two pictures.
The first one is the setup with a mikuni that was already broken when I bought the boat.
The second picture is what I assume is a better install for a new one?
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Second option is the best , I have the same unit things to watch out for: keep fuel line away from hot exhaust also I had the hotair outlets come loose at least 2 times used copper top sillicone hi heat gasket material To fix that excellent unit
air flow can be very hot if outlet is close to the unit
Still treating a burn on side of my right foot
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28-04-2023, 16:58
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#12
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Registered User
Join Date: Apr 2023
Location: Norway
Boat: Viksund Goldfish 31 feet
Posts: 25
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Re: Diesel heater fuel pump placement
Quote:
Originally Posted by c.K.
Second option is the best , I have the same unit things to watch out for: keep fuel line away from hot exhaust also I had the hotair outlets come loose at least 2 times used copper top sillicone hi heat gasket material To fix that excellent unit
air flow can be very hot if outlet is close to the unit
Still treating a burn on side of my right foot
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Yikes, that sounds pretty bad. I’m Norwegian so I struggle a little bit with the lack of punctuations, but I think I understand what you’re saying.
On my new heater I’m surprised how close the fuel intake is to the exaust outlet, but it’s the same china brand that everyone use.
My biggest issue now is that the older exhaust exit is slightly bigger in dimensions than my new one. I just need to figure out some solution/adapter.
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28-04-2023, 19:51
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#13
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Registered User
Join Date: May 2021
Posts: 185
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Re: Diesel heater fuel pump placement
Quote:
Originally Posted by SailorJoJo
Yikes, that sounds pretty bad. I’m Norwegian so I struggle a little bit with the lack of punctuations, but I think I understand what you’re saying.
On my new heater I’m surprised how close the fuel intake is to the exaust outlet, but it’s the same china brand that everyone use.
My biggest issue now is that the older exhaust exit is slightly bigger in dimensions than my new one. I just need to figure out some solution/adapter.
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You could cut 1inch piece of bigger exhaust and shimm it with the help of some Hi heat gasket material
you may have to flatten it and then wrap it around your smaller exhaust
Myself : since you are not allowed to have the exhaust longer than 3 feet or so ,l I drilled a bigger hole into my bathroom wall fed the flex exhaust through and angled it up in to an 1.3/4 316 tube going up 6 feet and then out through the roof
The bigger wall holes I filled with fibre glass cord soaked in hi heat resistant bedding material
At the start up there is a puff of smoke in my well vented bathroom but once running no problem what so ever
As a chimney cap I used an old propane exhaust cap
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29-04-2023, 16:48
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#14
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Registered User
Join Date: Apr 2023
Location: Norway
Boat: Viksund Goldfish 31 feet
Posts: 25
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Re: Diesel heater fuel pump placement
Quote:
Originally Posted by c.K.
You could cut 1inch piece of bigger exhaust and shimm it with the help of some Hi heat gasket material
you may have to flatten it and then wrap it around your smaller exhaust
Myself : since you are not allowed to have the exhaust longer than 3 feet or so ,l I drilled a bigger hole into my bathroom wall fed the flex exhaust through and angled it up in to an 1.3/4 316 tube going up 6 feet and then out through the roof
The bigger wall holes I filled with fibre glass cord soaked in hi heat resistant bedding material
At the start up there is a puff of smoke in my well vented bathroom but once running no problem what so ever
As a chimney cap I used an old propane exhaust cap
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I thought of doing that, cutting a ring from a bigger exhaust and fill the rest with the high heat gasket stuff.
But the exhaust not being longer than a meter/3 feet? Mine is at least 1,5 meters. I've never heard of that.
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30-04-2023, 07:10
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#15
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Registered User
Join Date: May 2021
Posts: 185
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Re: Diesel heater fuel pump placement
Quote:
Originally Posted by SailorJoJo
I thought of doing that, cutting a ring from a bigger exhaust and fill the rest with the high heat gasket stuff.
But the exhaust not being longer than a meter/3 feet? Mine is at least 1,5 meters. I've never heard of that.
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In case you have the orange china planar heater, that is what is says in the, instructions, any ways there is an issue with condensation in the exhaust , like I said before mine goes into a much bigger diameter pipe strait up 6feet
Isn't there a muffler with yours?
the small exhaust pipe that came with the unit did not fit this muffler but the flex exhaust you can buy will, so here I used a piece of the bigger pipe and wisted it on the smaller with some effort, in this way you can use that muffler as connection once again use hi heat sillicone gasket mat .
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