[Vwdiesel] Losing Prime

[mark shepherd]

As it returns with the pump's return, it's definitely the pump, so its 
somehow linked with the main chamber, if not a scratch under the outlet 
banjo washer, how about the seal linking the aneroid to the main chamber, 
conveniently hidden. Is there even one on the linkage?

Mark


----- Original Message ----- 
From: "Andrew .Libby" <libbybapa at gmail.com>
To: <LBaird119 at aol.com>
Cc: <vwdiesel at vwfans.com>
Sent: Thursday, December 08, 2011 6:23 PM
Subject: Re: [Vwdiesel] Losing Prime


> As I said, I swapped the pump and it no longer lost prime.  I replaced the
> first pump and it happens again.  That would seem to me to eliminate 
> issues
> with anything external to the pump except possibly the banjo washers which
> were all replaced with new washers and were torqued well.  The seats on 
> the
> pump look good too.  Are there any locations on the pump itself, other 
> than
> the inlet banjo washers and the main shaft seal, that are under inlet
> pressure/vacuum instead of internal pressure?  I'm thinking the outer
> timing piston cover and possibly the top pressure regulator o-ring...
>
> Andrew
>
> On Thu, Dec 8, 2011 at 10:58 AM, <LBaird119 at aol.com> wrote:
>
>>
>> In a message dated 12/8/2011 9:02:17 A.M. Pacific Standard Time,
>> libbybapa at gmail.com writes:
>>
>> Are  there any other
>> locations that might let air in without leaking diesel fuel  out when
>> running?  Any other thoughts?
>>
>>
>>
>>
>> Lots and my Rabbit had all of them at one time!
>>  The fuel return hose gets weepy with old age (the bigger, to the
>> tank one).  The small lines can leak, especially at the injector
>> nipples, if it's vacuum hose instead of the yellow stripe stuff.
>> Injector nipples can get bumped and crack or simply leak where
>> pressed in.  Banjo bolts can leak a little if not tight, dirt,  etc.
>> ANY hose to tube fitting can loosen up over time as the hose ages.
>> Don't forget return line to tank fittings if all else failis.
>>  Leaks will generally leak air before they leak any fuel but USUALLY
>> will be slightly dampened at least.  Clean any suspect areas with some
>> aerosol brake cleaner then run a bit.
>>    Loren
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