Hi Steve, I just like the idea of a gauge. I've had problems with electric fuel pumps in the past and 1 fast look at the gauge tells me I have fuel pressure I don't have fuel pump problems. eingine runs fine all the time,I'm not haveing any problems in that area.1 thing I forgot to mention is that a lot of times the gauge will read 0. A couple of times when the gauge was reading 0, I turn off and restarted the engine, the gauge will then have 3 psi. I tried to do the same thing with the on off switch on the fuel pump but that made no difference. I also put some die electric grease on the wire harness plugs on both the sending unit and the gauge end,but that shouldn't make it work funny.

Last edited by Bob 1955 (7/12/2013 8:02 PM)

 
 
I really don't know for sure if the gauge is hooked up to an actual 12 volt wire. I have a couple of wires under the dash that I found and have other things hooked up to it also. I know that the positive wire that the gauge is hooked up to only has power when the ignition switch is in the on and start positions. The instructions to the gauge does say that I need to hook the positive wire up to the ignition switch + 12 volt connection and to have an inline 1amp 3ag fuse, and I do. It also says to have the ground wire to a good engine ground with a picture of the ground wire running to the negative side on the battery.I have the ground wire grounded to the metal dash just like all the other grounds for oil ,water temp, volt gauge lights.  I'm going to go out on a limb and say I don't think that would make that much difference, or would it ?  I guess I could take a volt meter and check what kind of voltage is at that + connection I have the gauge hooked up at.  
 
 

MustangSteve wrote:

Oh, OK... So this is one of those things where you need a gauge to be sure your electric fuel pump is functional?  Kind of like adding shackles because the rear tires are too big...  LOL

I will keep quiet...

 
The airtex pumps I use are pretty quite.I had one leave me stranded about 30 miles from home one time and it was good to know just by the pressure gauge what the problem was even before the tow truck got to me.
No, I wouldn't use shackles. Don't tell me your back tracking on your moniker ? (  Money you enjoy wasting is not wasting Money. ) 
 

 

The gauge is reading steady when it is reading, the needle doesn't bounce around or fluctuate when it's working. Randomly upon start up of engine the gauge either does not read any pressure, or it reads 3 psi or 8 psi.   
 
 

Last edited by Bob 1955 (7/13/2013 9:05 AM)

I just had this discussion with the owner of a local speed shop.  His feeling is that the gauge is prolly accurate when you first start the car, after that all bets are off.  there are alot of factors, one being vibration, that is why the better ones are filled with fluid to reduce the vibration.  Second temperature, I would just imaging temperature from the engine or exhaust or just the air temp could change the fuel pressure.
I have ran natural gaslines across the roof of many buildings over the course of several years and when we are done we usually test them with air pressure.  I have learned the the hot sun shining down on a couple hundred feet of black pipe laying on a black roof will cause the pressure to rise as well as drop.
Like MS said the carb can cause the gauge to change pressures as well.
I have one under my hood just as a reference!! I cant see it going down the road,  I figure if its running right then fuel pressure is where it should be

MustangSteve wrote:

I am probably more guilty of adding things that cause extra work and grief than anyone.  427 with TKO in a 66 is a good example.  I just never have understood the need for an electric fuel pump on a street driven car with a carburetor.  The manual pump will work nearly forever and cost 1/3 of what that tow job cost you, much less what you paid for the pump and the wiring and the gauge to monitor why it is not working.  It is an item that I see as NO IMPROVEMENT over a factory piece, so that is why I am always dismayed at why anyone would do that to themselves.

Oh, and that "I will keep quiet" thing...  Yeah, right!!!

But, to answer your original question... Is it possible you have a piece of teflon tape used on the threads?  It could be blocking the sensing port of the gauge, which is a very small hole. Or fuel tank crud could be blocking the hole.

 
Steve, you having a bad day man ?  The attitude is somewhat questionable. It's been 8 or more years since my last visit it this forum and thought I would pop back in with a question on a problem I'm having, but that can be rectified. I'd like to thank the people that post some ideas on the problem and I'm sure I will come up with the answer to it, I always have.

 

Bob 1955 wrote:

MustangSteve wrote:

I am probably more guilty of adding things that cause extra work and grief than anyone.  427 with TKO in a 66 is a good example.  I just never have understood the need for an electric fuel pump on a street driven car with a carburetor.  The manual pump will work nearly forever and cost 1/3 of what that tow job cost you, much less what you paid for the pump and the wiring and the gauge to monitor why it is not working.  It is an item that I see as NO IMPROVEMENT over a factory piece, so that is why I am always dismayed at why anyone would do that to themselves.

Oh, and that "I will keep quiet" thing...  Yeah, right!!!

But, to answer your original question... Is it possible you have a piece of teflon tape used on the threads?  It could be blocking the sensing port of the gauge, which is a very small hole. Or fuel tank crud could be blocking the hole.

 
Steve, you having a bad day man ?  The attitude is somewhat questionable. It's been 8 or more years since my last visit it this forum and thought I would pop back in with a question on a problem I'm having, but that can be rectified. I'd like to thank the people that post some ideas on the problem and I'm sure I will come up with the answer to it, I always have.

 

 You are right.  I want to welcome you back to the forum, not run you off with opinions.  I did finally offr some suggestions as to what might be the problem...