Fuel Pressure Guage

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I had this posted in the acces. & a\m forum but there was no respone so I thought I'd try it here, let me know if I'm out of line.


Thanks.


Yesterday I went to Southern Diesel just S. of Atl. & talked with a couple of the mechs. there about installing Pressure guages. They said I could Tap a Banjo fitting to 1/8 pipe thread & install it in place of the Bleed plug on top of the stock filter housing. This would give me a post filter pressure reading, but, since the overflow return attaches to the inlet fitting there was no way to get a pre filter reading without cutting the supply line from the lift pump to the filter.
I hope I'm made myself clear. If anyone has any suggestions or input feel free to e-mail me.

And remember; "Any help at all, is a help". (I said that. )



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Gene Stanton
'97' 3500 Laramie SLT, Ext Cab, LB, 5 SPEED, 4. 10 Limited Slip, 4X4. No muffler. (it's a start)

 

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Take your fuel inlet fitting out of the inj. pump, drill & tap it for a 1/8" NPT. Install your fitting & you'll have proper fuel pressure readings. If you want to remove the gauge at a later date you can put a plug in the hole.

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Piers

 

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MuddFlapp the return valve is on the front?back of injector pump. The return fuel line goes directly to fuel tank from return fuel valve.
You should have two banjo fitting on top of fuel pump, one is inlet fuel line from low pressure fuel pump it has a adittional line coming from the fuel injectors(Don't recall the exact name but it fuel used to cool insectors than returned to fuel filter. ) The second banfjo fitting is the fuel supply line for the injector pump. There is a banjo fiting where the line goes into injector pump.
This is the one Piers is referring to. the mechanics were referring to the banjo fitting on the filter, that supplies fuel to injector pump,(post; after fuel goes thru filter). You can use these banjo fittings to bleed air out of fuel system.

 

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Piers; That looks like a good place to get pressure after the filter, what about before the filter? After crawling under over & through the enging compartment it looks like the supply line from the lift pump to the filter is the only way.

 

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Gene,IMHO the prefilter pressure isn't nessary. With just a postfilter gauge and a new filter you will find your rigs fuel pressure range. When it starts drop you'll know it's time to change your filter,unless your lift pump is going,then a new filter will only give you the same low pressure reading.

 

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Thanks illflem, sometimes you have to hit me with a brick to see the logic in something. I have a tendency to make things complicated. #ad

 

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Mudd Flap, another option very similar to what Piers suggested is to purchase a replace-ment fuel fitting from Miller tools (#6976), which is already tapped for 1/8 npt. I will be installing an electric fuel gauge this weekend, or when ever I get my 3-pod pillar mount an will be using this method.

 

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Where do I find Miller Tools?

 

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Gene,TST also has the adaptors DBR speaks of. I bought one to attach my sender to but decided against it,I felt that the engine vibration could break off the small bolt with the somewhat heavy sender attached to it. I did what Piers suggested,an 1/8" tap and the right sized bit will cost less than the adaptor. Just make sure to debur the tapped hole(a larger bit twisted by by hand will work well)and clean everything well,injector pumps don't respond well to metal chips. Also use antiseize,not teflon tape,on the sender threads and you'll be in business.

 

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Illflem, this is not the same adapter which I believe TST offers. The fitting replaces the factory fitting completely at the pump. There is far more metal then if you were to tap the factory fitting. This item is what you would receive when you purchase the fuel pressure kit for the P-7100 pump from Miller. You can find Miller Tools on the Web.

[This message has been edited by DBR (edited 09-07-2000). ]

 

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Miller Tools - http://www.spxmiller.com