[T3] FI help needed

[B Fye]

Jim,
It is just the o-rings that are leaking.  The silver cap area is good.  The
pump runs great other than that.  I'll just find some round o-rings that
fit.

Brian
On Nov 1, 2015 8:34 AM, "Jim Adney" <jadney at vwtype3.org> wrote:

> On 31 Oct 2015 at 21:48, B Fye wrote:
>
> > My OEM fuel pump is loosing much fuel from the o-rings by the oulet end.
> > Are they supposed to be flat?  Also, is there a part number for them?  I
> > need to order a pair.  The pump works great, just leaks way too much!
>
> Those O-rings are originally round, but they get flattened with age.
> I rebuild a LOT of those pumps, and I replace those O-rings as a
> matter of course, but I don't think I have EVER seen a leak there.
> Are you sure it's not coming from the little silver cap on the relief
> valve? That cap sometimes corrodes thru and that's where the leak is.
> leaks around the electrical connector or the motor housing are also
> rather common, but those tend to happen most often on pumps that have
> dried out.
>
> Drying out allows the O-rings to shrink so they no longer seal. If
> this is the case with this pump, it MAY seal again if the O-rings are
> allowed to soak in gas for a few days and swell back up.
>
> Rebuilding your pump will cost $75 plus return shipping if the motor
> runs and there are no leaks at the electrical connector or the motor
> housing. This repair fixes the O-rings, the relief valve cap, and the
> relief valve piston (which is starting to fail on all our pumps at
> this age) and is all that most pumps require.
>
> If I have to take the motor portion apart to replace the other 2
> O-rings, the price goes up to $125, plus return shipping.
>
> Return shipping would be $18 in either case.
>
> I prefer rebuilding the OG Bosch pumps to replacement with a modern
> pump, because it means that you don't have to re-plumb the fuel
> lines, move the pump to a different location, and cut off the
> original electrical connector. If you just need the basic pump head
> rebuild, the cost is the same as the aftermarket pump.
>
> Once rebuilt, the pump should last as long as it did the first time
> around, as long as you have done something to repair your cracked
> overflow hose. Most of the pumps I rebuild have suffered from some
> amount of abuse from water and dirt that came in thru those cracks.
> Water and dirt in your system will damage any pump you put in there,
> as well as the gas tank and all other parts of the FI (or carb)
> system.
>
> --
> *******************************
> Jim Adney, jadney at vwtype3.org
> Madison, Wisconsin, USA
> *******************************
>
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