Technical HELP PLEASE Fuel pressure problem

One more time - ARE YOU HAVING A DRIVABILITY PROBLEM?
Or a guage that doesn't say what you think it should

 

Mostly gauge not saying what it should say... But when i did have some problems when i dialed the pressure down a bit under acceleration

 

Then chase the guage down.

The info is all over the place, the liquid filled gauges needle shows a drop in pressure as the liquid heats up put the actual pressure in the line is fine.- a hot guage tells lies.

 

Im thinking next time it reads zero submerge the regulator its attached to in an ice water bucket and see what happens

 

If you were blazing trails in the field of diagnosing alien technologies with no data to fall back on that would be a great way to start.

However there is plenty of data, research is there and do***ented.

Get one of these. Hook it up , rig into windshield wiper and drive the car. Observe what happens. When this says there is 4 lbs and your guage says zero the culprit will show itself.



Your mention of 3 psi setting might be too low.

 

We don't get a lot of 100 + up here but Yes in both cars. I-5 rush traffic in Portland is Stop and Go for 25 miles, that translates into ideling for up to Hour and a half and when it's 90 + no issues (yet).
The Wizzard

 

How will 4 lbs of manifold vacuum from the wiper connection tell you anything about fuel pressure?

 

He means put the guage on the wiper arm so you can read it

 

that gage is liberal.

 

Where to start ughhh

 

What if it starts raining?

 

use one of these.

 

Im not getting this. I say just go with one pump. (mechanical) then filter then gauge that is close onto the carb. Make it all simpler better. Run stock style line. No reducers or watevr. And then maybe put some heat wrap around the line after the pump of you think its nesesary and see if it help from vapor loc and mechanical fan will help keep some of that cool if your running that. And i dont get how intake va***e will let u know what is going on? But main thing dont run two pumps that just sounds like blockage to me puting to much strain on the carb to get the fuel it needs. So much on the line.

 

Then you have a scratched up windsheild

 

Subscribe, as I want to see how this comes out! Enough different opinions in this to rival the presidential debates.

 

Usually the manifold vacuum drops causing a inverse drop in fuel pressure.
Although this relates to transmissions the theory is explained here and its application is exactly the same.

 

Hmmm

 

Liquid filled gauge? Those gauges are sensitive to heat. The heat causes the liquid to expand and the internal pressure will drive the needle down to zero, even when you actually have fuel pressure.

As someone noted above, these gauges often have a rubber plug that you can "burp" the pressure out from. I solved the same problem on a gauge by draining about half of the liquid out.

Oh, and guys please remember that political posts WILL get this thread shut down. Save it for Facebook.

 

I will definetely try burping the pressure

 

^^^^^^^^^^^ I'm well aware of the political post prohibition, but if you think my post is polittical, I think you're a nit picker!!!!!!!!!!

 

and yes its a liquid one

 

I'm not a moderator, I just don't want to see the thread shut down. People today tend to use any opening to insert their ideology. And, it wasn't just you....

 

I, and for that matter nobody who's posted in this thread has posted anything concerning ideology, IMO, just commnents concerning there were differing opinions plus extraneous comments.

 

Go with mechanical pump and new fuel hose and good clamps and filter between pump and carb...daily driven A coupe, 400 ponies, daily driven, over 100 degree heat.....your prob just ****ing' air if ya get vapor lock

 

Sorry, my filter is right before the mech pump

 

the needle swings both ways. sorry for the vague reference.
the gage isn't reading vacuum, it will read fuel pressure.

 

Its a byp*** regulator? Is the return seperate from the inlet of the electric fuel pump? If they are common then the electric could be pulling from the regulator. Like if you have a line coming from the tank and it 'tee's before the electric pump, one line going to the pump & the other the return line then the electric pump could draw from the byp*** regulater easier than from the fuel tank and you'd just be circulating fuel basically from the outlet of the electric pump thru the mechanical pump to the return line of the byp*** and back to the inlet of the pump.
It sounds like a Rube Goldberg contraption but I'll throw it out there.

 

UPDATE: Ok good and bad news yall... First off good.. Like some off yall mentioned there was a plug on the side of the pressure guage to burp the guage... I did this while the guage was hot and the pressure went up to about 3 pounds... I thought YES i solved the problem and have been chasing ghosts this whole time...soooo i take the olds though town... It does great... So then i really give it some gas on a longer strech of road and then heres the bad.. The power starts to cut and it makes the loudest gunshot backfire its EVER made... So it was fine under about 50 mph... So i thought maybey carb probs but then when i got it back home i spun up the motor and watched the guage go down and down and down until the engine hesitated... I AM STUMPED