Re: [T3] Fuel pump for EberspŠcher gas heater

[Per Lindgren <lindgre@online.no>]

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Jim Adney wrote:

> On 2 Jan 2003 at 16:21, Per Lindgren wrote:
>
> > The diaphragm actually hasnt hardened, and the pump is running. I have 
> > installed it and it runs, but it's not able to pump fuel up from the 
> > tank.
>
> There are only 2 reasons that a pump would run and yet not pump: bad diaphram 
> or bad check valves. Have you cleaned out the check valves in yours?
I did clean the check valve as well, it was pretty full of the white 
"chalk" stuff.

> I guess another possibility would be air leaks anywhere into the line leading 
> into the pump.
That is a possibility, but I did check that as well, and the only place 
where that might be a possibility is between the filter and tank, as 
that is the only place where there are regular hoseclamps. The other 
hoses have banjo fittings and similar.

Two other things I thought might be the problem is. One is that I could 
have messed up the settings for the pump when I assembled it, so that it 
doesnt have big enough stroke. I dont know how sensitive these things 
are, as I said, I have absolutely no experience with electrical fuel pumps.

The other could be that the hose (steel spun rubber) could be pinched. I 
took off the hose that runs between the outlet of the pump and inlet of 
the pressure regulator, it was dry, and I tried to blow through it. I 
noticed that the passage wasnt entirely free, so I tried to straigthen 
it a bit, and it was easier to blow through then. Of course, when I 
installe dit again, it went back to it's previous shape, so it might be 
pinched a bit, making it hard for the pump to press fuel through it.

I am going to open the pump that was attached to this heater, as it used 
to work perfectly only a couple of years ago, but doesnt now. I'll be a 
bit more careful and take some measurments.

PerL
73 Variant l


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