Help with electrical fuel psi gauge

Coolbreeze · 10-15-2003, 08:47 PM

10-14-03
For you running electrical fuel pressure gauges, I have a question. Does your needle move when you are driving?? Mine seems to sit at 30psi and go up to about 32psi when I nail down on it. I set the psi at about 36-40 and no matter what psi, I set it at,, it reads the same. I set with the vac off and the when driving and watching the gauge is with the vac on......Just wondering if this was correct...

Part 2: 10-15-03
Well ,, anyway today it is acting totally different.. It still sits at 30psi, but when I give it gas or get on it the psi goes down to about 22psi. Think, maybe the sending unit is messed up??? This sucks too, I want a FP gauge on when I install the blower...

billheis · 10-16-2003, 01:53 AM

Hey Mike sounds like somrthing not working right. You send you set the pressure 36-40, did you use a mechanical gauge? Yes it will move around but it should go up when you get on onit. Usually a 8 to 10 psi lowerwith vacuum hook up

Coolbreeze · 10-16-2003, 02:45 PM

I also hooked a mech gauge up to check. I have 2 schrader valves, on behind the alt and one by the regulator. And when I set it at 36-38psi on the mech gauge I was getting about 35-37psi on the electric, with vac off..When I put vac back on they both drop some like to 30 on the electric and 32 on the mech..

Only thing is I can't watch the mech gauge when driving, this is one I bought from the parts store and mounts to the schrader valve with about a 1ft long hose. But when I get on it the psi drops to abotu 22-24 on the electric gauge. You think, running 30# and 255 HP in tank, have something to do with it. Since the injectors deliver more fuel, would the volume be there but not the pressure???????

billheis · 10-16-2003, 09:57 PM

It shouldn't. a 255 pump should have at least 70 psi open pressure. And it should be able to move plenty of volume at 40 psi. You may have a pick up problem in the tank or pump maybe going away on you

Coolbreeze · 10-17-2003, 11:19 AM

THX-- billheis

I am going to try a test an autometer tech suggested to see how the gauge responds. I hope it isn't the pump

I really don't feel like dropping the tank

10-15-2003, 08:47 PM	#1
Coolbreeze Registered Member Join Date: Oct 2000 Location: ~Columbus~GA~31909~ Posts: 156	Help with electrical fuel psi gauge 10-14-03 For you running electrical fuel pressure gauges, I have a question. Does your needle move when you are driving?? Mine seems to sit at 30psi and go up to about 32psi when I nail down on it. I set the psi at about 36-40 and no matter what psi, I set it at,, it reads the same. I set with the vac off and the when driving and watching the gauge is with the vac on......Just wondering if this was correct... Part 2: 10-15-03 Well ,, anyway today it is acting totally different.. It still sits at 30psi, but when I give it gas or get on it the psi goes down to about 22psi. Think, maybe the sending unit is messed up??? This sucks too, I want a FP gauge on when I install the blower... __________________ Mike Blown~AOD'ed~331~ T-top~ 86GT Check out car on my page here ------ > ~~My 86GT T-top ~~

10-16-2003, 01:53 AM	#2
billheis Registered Member Join Date: May 2001 Location: Fernandina Beach, FL 32034 Posts: 178	Hey Mike sounds like somrthing not working right. You send you set the pressure 36-40, did you use a mechanical gauge? Yes it will move around but it should go up when you get on onit. Usually a 8 to 10 psi lowerwith vacuum hook up __________________ Bill Heiser 90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter

10-16-2003, 02:45 PM	#3
Coolbreeze Registered Member Join Date: Oct 2000 Location: ~Columbus~GA~31909~ Posts: 156	I also hooked a mech gauge up to check. I have 2 schrader valves, on behind the alt and one by the regulator. And when I set it at 36-38psi on the mech gauge I was getting about 35-37psi on the electric, with vac off..When I put vac back on they both drop some like to 30 on the electric and 32 on the mech.. Only thing is I can't watch the mech gauge when driving, this is one I bought from the parts store and mounts to the schrader valve with about a 1ft long hose. But when I get on it the psi drops to abotu 22-24 on the electric gauge. You think, running 30# and 255 HP in tank, have something to do with it. Since the injectors deliver more fuel, would the volume be there but not the pressure??????? __________________ Mike Blown~AOD'ed~331~ T-top~ 86GT Check out car on my page here ------ > ~~My 86GT T-top ~~

10-16-2003, 09:57 PM	#4
billheis Registered Member Join Date: May 2001 Location: Fernandina Beach, FL 32034 Posts: 178	It shouldn't. a 255 pump should have at least 70 psi open pressure. And it should be able to move plenty of volume at 40 psi. You may have a pick up problem in the tank or pump maybe going away on you __________________ Bill Heiser 90 Convertable 5.0 LX, ported E7s w/ THumper valve job, TFS street, FR 65mm TB, B cam w/1.7 cobra rockers, kirban AFPR, Mac CAI, Mac Headers, off road h, 3 chamber flows, Crane ign. box, 3:73s, Art Carr AOD & 2600 converter

10-17-2003, 11:19 AM	#5
Coolbreeze Registered Member Join Date: Oct 2000 Location: ~Columbus~GA~31909~ Posts: 156	THX-- billheis I am going to try a test an autometer tech suggested to see how the gauge responds. I hope it isn't the pump I really don't feel like dropping the tank __________________ Mike Blown~AOD'ed~331~ T-top~ 86GT Check out car on my page here ------ > ~~My 86GT T-top ~~

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