need help w/fuel pressure regulator

88stang · August 6th, 2008, 10:47 PM

I just put a fuel pressure gauge on to make sure my fuel pressure is were it needs to be. I was told to start the car with the vacum line disconnected adjust the regulator around 36lbs and put the vacum line back on the also said that when the vacum line is hooked back up that the pressure would increase but when I hook the vacum line back up the pressure drops. Is this a definate sign that the regulator is bad.

nolife · August 6th, 2008, 11:33 PM

Sounds like it is operating fine to me. You either did not understand what the person told you or that person is wrong. Fuel pressure changes with vacuum, the more vacuum, the lower the fuel pressure. With the vac line removed when you are adjusting, that is a vac of 0 and the highest fuel pressure you should ever see. 39# is the stock setting.

88stang · August 7th, 2008, 12:35 AM

I must have miss understood the person that told me that. Thanks! Now I changed the fuel pressure regulator any how and set the new one at 36psi. My car still does not want to restart after it is warm any suggestions.

1989Gt. · August 7th, 2008, 05:44 AM

dude i just did the yesterday and found out my fuel pump is done.... so if its going down thats what it is kkk trust me yesterday its working fine it should idol at 45 psi...

95opal · August 7th, 2008, 07:51 AM

Vacum off the reg, plug the other end and set the pressure to 39. Plug vac back in and your done.

88stang · August 7th, 2008, 08:02 AM

Thanks! Any ideas why it doesn't want to restart It did not do this when the 19lbs were in which was just a couple weeks ago and this started as soon as the 30's were installed.

95opal · August 7th, 2008, 08:08 AM

If your running 30#s w/ no tune it will be rich on start up. To clear the problem just hold the pedal to the floor it will start then. BTW are you using the correct MAF for the 30#s?

88stang · August 7th, 2008, 09:45 AM

I've tried that and that does not start it floods the hell out it which I've been told you can't flood a fuel injection but you sure can smell alot of fuel when I try that. As far as I know I baught a 76mm maf calibrated for 30's I'm going to call C & L and make sure that the flow tube they sold is the correct one.

1slo5.0 · August 7th, 2008, 11:39 AM

Originally Posted by 88stang

I've tried that and that does not start it floods the hell out it which I've been told you can't flood a fuel injection but you sure can smell alot of fuel when I try that. As far as I know I baught a 76mm maf calibrated for 30's I'm going to call C & L and make sure that the flow tube they sold is the correct one.

Yes you can flood fuel injection. I wouldn't take anymore advice from the person that told you that.

Did you try setting the fuel pressure to 32psi yet?

88stang · August 7th, 2008, 02:55 PM

Not yet, it has been raining.
Thanks

88stang · August 7th, 2008, 02:58 PM

[QUOTE=Darrell;1343388]Yes you can flood fuel injection. I wouldn't take anymore advice from the person that told you that.

That's been a while since I heard that back before I ever started the restoring on this car

1989Gt. · August 7th, 2008, 03:41 PM

oh

August 6th, 2008, 10:47 PM	#1
88stang Regular 1988 Mustang Join Date: Mar 2006 Location: Huntsville, Alabama Posts: 99 iTrader: 0 reviews	need help w/fuel pressure regulator I just put a fuel pressure gauge on to make sure my fuel pressure is were it needs to be. I was told to start the car with the vacum line disconnected adjust the regulator around 36lbs and put the vacum line back on the also said that when the vacum line is hooked back up that the pressure would increase but when I hook the vacum line back up the pressure drops. Is this a definate sign that the regulator is bad.

August 6th, 2008, 11:33 PM	#2
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	Sounds like it is operating fine to me. You either did not understand what the person told you or that person is wrong. Fuel pressure changes with vacuum, the more vacuum, the lower the fuel pressure. With the vac line removed when you are adjusting, that is a vac of 0 and the highest fuel pressure you should ever see. 39# is the stock setting. __________________ Last edited by nolife; August 6th, 2008 at 11:48 PM.

August 7th, 2008, 07:51 AM	#5
95opal Hardcore Enthusiast 95 opalfrost gt Join Date: Nov 2006 Location: Connecticut Posts: 1,516 iTrader: 0 reviews	Vacum off the reg, plug the other end and set the pressure to 39. Plug vac back in and your done. __________________ 5.0 magazines 94-04 performance mustangs feature car! Fall 2010

August 7th, 2008, 08:08 AM	#7
95opal Hardcore Enthusiast 95 opalfrost gt Join Date: Nov 2006 Location: Connecticut Posts: 1,516 iTrader: 0 reviews	If your running 30#s w/ no tune it will be rich on start up. To clear the problem just hold the pedal to the floor it will start then. BTW are you using the correct MAF for the 30#s? __________________ 5.0 magazines 94-04 performance mustangs feature car! Fall 2010

August 7th, 2008, 09:45 AM	#8
88stang Regular 1988 Mustang Join Date: Mar 2006 Location: Huntsville, Alabama Posts: 99 iTrader: 0 reviews	I've tried that and that does not start it floods the hell out it which I've been told you can't flood a fuel injection but you sure can smell alot of fuel when I try that. As far as I know I baught a 76mm maf calibrated for 30's I'm going to call C & L and make sure that the flow tube they sold is the correct one. Last edited by 88stang; August 7th, 2008 at 09:48 AM.

August 7th, 2008, 12:35 AM	#3
88stang Regular 1988 Mustang Join Date: Mar 2006 Location: Huntsville, Alabama Posts: 99 iTrader: 0 reviews	I must have miss understood the person that told me that. Thanks! Now I changed the fuel pressure regulator any how and set the new one at 36psi. My car still does not want to restart after it is warm any suggestions.

August 7th, 2008, 05:44 AM	#4
1989Gt. Hardcore Enthusiast 1989 Mustang GT Join Date: Apr 2008 Posts: 2,799 iTrader: 0 reviews	dude i just did the yesterday and found out my fuel pump is done.... so if its going down thats what it is kkk trust me yesterday its working fine it should idol at 45 psi...

August 7th, 2008, 08:02 AM	#6
88stang Regular 1988 Mustang Join Date: Mar 2006 Location: Huntsville, Alabama Posts: 99 iTrader: 0 reviews	Thanks! Any ideas why it doesn't want to restart It did not do this when the 19lbs were in which was just a couple weeks ago and this started as soon as the 30's were installed.

August 7th, 2008, 02:55 PM	#10
88stang Regular 1988 Mustang Join Date: Mar 2006 Location: Huntsville, Alabama Posts: 99 iTrader: 0 reviews	Not yet, it has been raining. Thanks

August 7th, 2008, 02:58 PM	#11
88stang Regular 1988 Mustang Join Date: Mar 2006 Location: Huntsville, Alabama Posts: 99 iTrader: 0 reviews	[QUOTE=Darrell;1343388]Yes you can flood fuel injection. I wouldn't take anymore advice from the person that told you that. That's been a while since I heard that back before I ever started the restoring on this car

August 7th, 2008, 03:41 PM	#12
1989Gt. Hardcore Enthusiast 1989 Mustang GT Join Date: Apr 2008 Posts: 2,799 iTrader: 0 reviews	oh

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