Tapping the fuel line to install air heater

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JMK
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Tapping the fuel line to install air heater

Postby JMK » Sat Oct 28, 2017 2:17 pm

Looking for some guidance in tapping the fuel line in an L300 to provide fuel to an Espar D2 air heater clone.

Can I directly break into the existing fuel line and butt a 'T' into it rather than tapping a tube directly into the fuel tank?

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Growlerbearnz
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Tapping the fuel line to install air heater

Postby Growlerbearnz » Sat Oct 28, 2017 3:48 pm

I would tee into the rubber fuel hose between the tank and fuel filter. It would be much easier, less likely to break due to vibration, and reversible if it all goes wrong.

Here's an Espar install into a diesel motorhome: https://www.rvworldstore.co.nz/blog/installing-eberspacher-diesel-heater/
Nothing says "poor workmanship" more than wrinkles in the duct tape.

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JMK
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Tapping the fuel line to install air heater

Postby JMK » Sat Oct 28, 2017 7:39 pm

Thanks Growlerbearnz,

Teeing into a rubber line sounds perfect, I was thinking it would be necessary to cut a metal line, with the associated risk of creating filings, etc.

I'll look for the location and go from there. I assume that you would anticipate the possibility of an air bubble and prime the fuel line after the install.

One thing I've noticed about a number of the installs I've seen documented, is none seem to have used the benefits of carbon felt, which can be a very handy material for jobs like this. I'll post some pictures as the job progresses if there's anything positive I can contribute.

I friend just pointed out to me while I wait to finish my install, the mice are probably enjoying the new entrances I created and did not block yesterday.

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JMK
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Tapping the fuel line to install air heater

Postby JMK » Tue Oct 31, 2017 8:24 pm

Tonight tested the install by placing the fuel line into a jerry can of diesel. The pump self primes, takes about 5 minutes when the line is vacant.

So now that I know it works, searching for the best spot to drill for fuel led me to contemplating the bleed port on the fuel filter as a possible candidate. Some research seems to indicate that the check valve that was used in another post is a good idea as apparently these heaters can draw back at times. But I'n wondering, if it's possible to find a barb with the same threads as the bleed port on the filter, and using a check valve to stop the fuel backing up and possibly putting air into the fuel system, if this port on the fuel filter would supply fuel on demand to the heater's fuel pump?

Does anyone know perhaps if that port is 'pre', or 'post' filter, and when a vacuum is applied to it, will it supply fuel on demand?

204explorer
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Tapping the fuel line to install air heater

Postby 204explorer » Wed Nov 01, 2017 7:40 am

I would follow Growlers advice. I installed plenty of these heaters and never use the supplied fuel pick up tube, unless its already there from a previous heater.
I always cut the rubber fuel line, low and close to the tank and then put a barbed tee fitting in the existing line. Made myself a kit with brass tees and different barb size fittings that thread into the tee. Now its easy to work with different size hoses.
I would not put it in the bleed port of your fuel filter.
I never used a fuel check valve, never had a issue with that.
Also not a fan of coolant line shut off valves. They often cause leaks.
What you might need, depending on your install, is a coolant line check valve.

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JMK
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Tapping the fuel line to install air heater

Postby JMK » Wed Nov 01, 2017 8:09 pm

Thanks for that.

I'm just installing an air (bunk) heater, so do not need to tap into coolant. About the only convenient place I can find a rubber fuel line to tap into is the one coming up to the fuel filter, so I may try that.

I did notice in one of the forums that someone mentioned that if they did not stick with the small diameter fuel lines that had more problems with the pump self priming, because the pumps themselves are pretty small, so I thought I should stick with the stock line that came with the kit.

When crawling around under the L300 today I noticed what appeared to be a drain plug on the bottom of the main fuel tank and thought that would be convenient if there was a tap with the same threads as the drain plug.

Furi
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Tapping the fuel line to install air heater

Postby Furi » Fri Nov 03, 2017 3:46 pm

JMK wrote:Looking for some guidance in tapping the fuel line in an L300 to provide fuel to an Espar D2 air heater clone.

Can I directly break into the existing fuel line and butt a 'T' into it rather than tapping a tube directly into the fuel tank?


I'll be doing the same thing in the next few weeks. Wondering what location you have picked for the heater. Inside the cabin? Or boxed up under the car? Look forward to seeing your install.


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