I am looking to order my Fuel Pressure Gauge here real soon. My concern is this this particular gauge only accepts up to 16 psi. My truck has a new Holley Blue pusher pump installed with the stock VP44 and origional (working) engine mounted ( carter i think) lift pump.

With all the fuel i'm pushing, i think i'm over 16 psi at idle. Sound right?
I guessing i'm only pushing MAYBE 20psi. no more than that.

My question is what are the dangers of over pressurizing the gauge?

It's an eletric gauge so no fuel will be introduced into the cab of the truck.



Since it's a digital gauge is there a different sending unit that will support up to 30, or maybe 60 psi?

Also, what is the best wway to install a guage? Is a tapped banjo bolt in the fuel / water seperater the best way?
If so, where can i get such a bolt?

any help on this matter will be greatly appreatiated!!!!

here is the gauge i was looking to use:

http://egauges.com/vdo_ind.asp?Type=...e&PN=A012E351Y

 

Get a gage that reads in middle of normal reading [ you have 20lbs =60lbs gage ].
Inside , out side is just a bet , if you can keep it from leaking .

 

so your telling me that if im pushing 20 pounds of fuel pressure i should get a guage that reads up to 60 pounds?

I was kinda hoping to keep the max guage pressure around what i'm pushing.
Of course using a digital guage this doent't matter..

The thinking was that the more the needle moved the better cause then it would catch my eye. For example if i got a 0- 100 psi guage the needle would bearly move.

Follow me?

But again a digital guage relives this theory.

 

I have a 30# gauge. autometer electric works very well. 14# at idle. 10# WOT. You need a gauge that reads in the middle of its range. just my .03 cents

 

You can do what ever you want , but you asked , this the standard in any industry , normal operating range should be in the middle of the gauge range .
Now you have gone to the other extreme , with the 100 lb .
I was in the auto repair buis. , in one way or an other , for about 30 yrs , it was the hardest for women to grasp , that if the needle is at either end of the gauge , that there was a problem , many a ruined eng. with no coolant , and they said , yes I looked at the gauge - it was always on the cold/cool end .
In this case how are you going to see a maximin reading ? if thats were the gauge is at all the time ?

 

The blue and a good stock carter will push around 24-28 psi so a 30 psi gauge is a good choice. Your really not to warried on the high side, just don't want it to drop to low. I have a 15 psi max and it stays pegged and I'm fine with that.

 

When I installed the RASP system I switched out my Autometer electric 0-15 psi because it was pegged all the time. Went to the 0-30 and get 18 idle and 15 normal driving.

Autometer tech person told me it was hard on the internals to have it constantly pegged. Don't know if that would apply to a digital guage.

 

Yes, you could stretch the spring in the gauge, keeping it pegged, and it would not return to 0. I would say in a digital, it would matter about that, or like you said might change the sending unit and it might read more, or it could read wrong. who knows. IMO, a machical 0-30 with fuel in the cab, and a neddle valve is the best bet, and reliable

 

thank you all for your opinions.

seems that it's best to try to keep the gauge in the midrange portion.

Thanks for the feedback.

I think i'll try getting a sending unit that'll read up to 60 psi to be safe.