Engine/Transmission (1998.5 - 2002) Snubber Size for Fuel Pressure Gauge?

[ox1]

I have toasted a cpl gauges over the yrs and I need to order a gauge for a hydro unit anyway, so plan on buying a new one for the truck as well and want to add a snubber this time.



This is the only place I have ever heard of them and have yet to see one. However I looked them up in my McMaster book just now and I find that my options are 2-5 micron, 10 micron, 40-45 micron, and 75 micron.



Now I know how big a micron is - or actually "isn't". But I have no practical experience in how each size will work. I think I may even add one to the hydro unit?



I am guessing that a courser one for the hydro and a finer for the fuel, but I'm guessing that I can get too fine? (Even at multiples - 2-5 don't add up real quick. )



So does 10 for the fuel and 45 for the hydro (indoors) sound logical?



Anyone with practical experience?





Yes - I could make one myself too, and was planning on it, but when I see them for $10 - well I'll just buy one. If I was to make one I would hafta put a . 030 min hole in it.





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[DFerverda]

I am not real sure what your asking, but here is my take on it.
The snubber i added to my fp gauge was a grease gun hose. Or you could use a needle valve to somewhat block the pulses from the vp.
The grease gun hose can be found at any farm or automotive store and is pretty cheap and has the right fittings on it.

What kind of hydro unit are you talking about?
Good luck

 

[CEdwards]

Not sure you even need one on a 24 valve. I used a needle valve from graingers, but even without it I don't see any pulsation at all. On a 12 valve with the mechanical fuel pump you will break a gauge in a minute unless you just barely crack the needle valve.

 

[ox1]

Hydro unit - not related to the truck. But I need to buy a gauge for it today.



Yes - the electric pump pulses the gauges.



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[CKelley1]

northern hydraulics, summit, and surplus center all have glycerine filled gauges. this is a better way to go. you do not need any thing but the gauge.

 

[BarryG]

A snubber is a fitting that is filled with a pourus brass looking like substance that lets fluid / pressure through but really slows the pulsations. The 24valve does get some pulsations. The 12 valve definitely gets them and they are pretty extreme due to the type of pump. On the 24V some say it is the electric pump but others say it is the vp44 causing them. In any case with my SPA gauges I can definitely see pulses so I just turn down the sampling rate. Autometer makes a snubber (part # AM3279) specifically for the dodge application and the 30psi gauges and I think they deny warranty on the sender if you are not using one. The needle valve essentially does the same thing. I have used a needle valve in the past and it did work but it seemd to always leak or should say weep. Could have been a poor quality valve. The liquid filled gauges help keep or slow the needle from pulsating but the pulse is still there, the needle just isnt reacting to it, the sender is still feeling it.



I have had the same sender for 200k and still works fine. However I did just convert over to a 12valve lift pump on my 24valve after a cam install and have put a snubber in because the pulsations are pretty significant.



Here is a place that sells the autometer one with a picture

Autometer Fuel Pressure Snubber / Restrictor 3279