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Internal pump pressure
by
Gator79
on 10 May, 2012 15:05
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I want to check internal pump pressure on my rabbit td, only thing I can find on here is tapping into the out bolt or the stand off neither of witch I want to do. Can I splice into the return line right after the out bolt or will that not give an accurate reading or evan work at all? If there's a better way please let me know thanks.
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#1
by
92EcoDiesel Jetta
on 10 May, 2012 15:31
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Return line gives external IP fuel return pressure- not what you're looking for. If you don't want to do the two you mentioned, another option is to drill a hole in the IP cover and put a barb there.
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#2
by
Blocksmith
on 10 May, 2012 15:39
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No, the holes in the "out" banjo bolt are tiny, which won't give you an accurate reading of the internal pump pressure unless you drill and tap the end of the bolt, which is directly connected to the internal pressure of the pump.
If you're hesitant to modify the bolt itself, you could (assuming you have access to some basic tools) make a new, custom stand-off which has a fitting for a pressure line to a gauge using stuff that should be readily available at a good hardware store. That's probably what I'll end up doing when I get around to checking my IP pressure.
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#3
by
92EcoDiesel Jetta
on 10 May, 2012 16:23
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Another option is rent it from me. I have a spare out pedestal, drilled and tapped for a pressure gauge.
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#4
by
smutts
on 14 May, 2012 12:42
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Or google the late "Hagar transfer pressure smileage" and you should find lots of info, dont use his transfer pressures unless yours is an early Rabbit.
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#5
by
vako
on 02 Oct, 2013 03:34
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i have one odd question about internal pump pressure. is it possible tu meaure appproximate internal pressure according to overflow quantity? in this document there are some figures about overflow values.... and i thought that measuring it will help me a bit. correct me if i'm wrong
my problem is that after heating up well car starts to twitch on light throttle. as soon as i push it hard twitching goes away. so i'm trying to find what could be the problem
cheers vako (y)
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#6
by
ORCoaster
on 02 Oct, 2013 09:01
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Hagar had quantity at idle figured out as well. Something like a liter in 90 seconds. Not sure on the liter part but go look. His premise was if it is proper at idle then the rest would take care of itself. If you didn't get the proper quantity then you would tap down on the regulator in the front of the IP and adjust it. Tap easy it only needs to move a tiny bit to change the internal pressure.
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#7
by
vako
on 02 Oct, 2013 09:07
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i've got one more question
where car i find hagar info? i've searched teh web but some links are dead and i was not able to find anything
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#8
by
mtrans
on 02 Oct, 2013 11:20
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Or google the late "Hagar transfer pressure smileage"
X2,work for my google.
or internal injection pump pressure.
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#9
by
vako
on 02 Oct, 2013 12:12
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the most informative thread i found was this
http://www.vwdieselparts.com/forum/viewtopic.php?t=5936&start=0 and read the whole topic.. but still there are no overflow values
i will have to wait for the sensor for 2-3 weeks (to be shipped from usa, i live in georgia country) so monitoring IP internal pressure with the pump is a bit of an issue for me
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#10
by
smutts
on 02 Oct, 2013 15:08
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I think this might has been the link, but it is a long one. Unfortunately the writer is no longer with us.
http://www.vwdieselparts.com/forum/viewtopic.php?f=8&t=4868A good rummage in the scrapyard should find a Bosch pump with a suitable pedestal. It's not just a VW thingy.
I would be most leery on the "driller killer" approach on a working pump, unless you want a hole in a knackered pump.
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#11
by
TylerDurden
on 02 Oct, 2013 15:20
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625ml/90 seconds... at idle, I believe.
If you google "Going back in the thread, Hagar said" (with quotes, for the phrase) you can see some discussion.
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#12
by
ORCoaster
on 02 Oct, 2013 15:27
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Smutts has the link proper. Just search for some terms mentioned here and you will find it.
I went looking for the summary sheet I started to build one time as I was reading the thread and can't find it on the computer now. Could be on the spare desktop one. The 625 ml looks better to me than my original 1 liter measure. Thanks for the correction TylerD.
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#13
by
mtrans
on 03 Oct, 2013 00:59
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#14
by
Toby
on 03 Oct, 2013 01:46
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No, the holes in the "out" banjo bolt are tiny, which won't give you an accurate reading of the internal pump pressure unless you drill and tap the end of the bolt, which is directly connected to the internal pressure of the pump.
If you're hesitant to modify the bolt itself, you could (assuming you have access to some basic tools) make a new, custom stand-off which has a fitting for a pressure line to a gauge using stuff that should be readily available at a good hardware store. That's probably what I'll end up doing when I get around to checking my IP pressure.
That won't work because the "tiny hole" is in the end of the bolt is a metering oriface and that end screws into the pump. Drilling and tapping the head of the bolt is still checking external pressure, not internal. Opening up the "Out" bolt oriface messes up the internal pressure.
