New Engine burning too much gas, Help.

NitroNixon · 02-14-2005, 02:58 PM

I'm getting horrible gas mileage after installing my explorer engine. The engine runs great and puts out great power compared to my stock 5.0 engine. But it seems that I'm getting between 9-10mpg in the city. I drive this thing everyday. It's my only set of wheels. Can someone tell me where I should set my fuel pressure? I'm beginning to think that I may be running the engine too rich, but If I let the engine sit and idle, I see water dropping out of my tailpipes every so often. What does that mean?

Fat0eknee · 02-14-2005, 07:09 PM

whats fuel pressure at now? i believe its supposed to be around 32 at idle

Dark_5.0 · 02-14-2005, 07:46 PM

Your fuel pressure should be at 38psi with the vacuum hose off and should drop to the low 30's with it re-attached.

NitroNixon · 02-15-2005, 08:56 AM

I think my adjustable fuel pressure regulator took a dump on me. Whenever I try to adjust the pressure, my guage will rise to 33lbs and stop at that setting, even if I keep turn the screw on the regulator, then when I turn the screw in the opposite direction the pressure goes down. When I try to turn the pressure back up, it won't go higher than 33lbs. And to make matters worse, this is with the vacuum off, so now I really don't know where my fuel pressure is set at, because I'm trying to decide if the gauge is bad or the adj. regulator is bad.

I do notice that after I tried to make the adjustments, my engine backfires when cold.

Dark_5.0 · 02-15-2005, 10:46 AM

I would throw the stock one back on there and see if it helps.

NitroNixon · 02-15-2005, 04:52 PM

Yeah, I was thinking the same thing. I'll try that.

02-14-2005, 02:58 PM	#1
NitroNixon Registered Member Join Date: Mar 2002 Location: DC Posts: 129	New Engine burning too much gas, Help. I'm getting horrible gas mileage after installing my explorer engine. The engine runs great and puts out great power compared to my stock 5.0 engine. But it seems that I'm getting between 9-10mpg in the city. I drive this thing everyday. It's my only set of wheels. Can someone tell me where I should set my fuel pressure? I'm beginning to think that I may be running the engine too rich, but If I let the engine sit and idle, I see water dropping out of my tailpipes every so often. What does that mean? __________________ 87 GT As of 2/1/06 650 DP Carb Crosswind Intake Edelbrock Performer Heads 97 Explorer Bottomend w/ B-303 Cam 1.7 Roller Rockers Flowtech Longtube Headers Flowtech H-Pipe MSD Black Wires MSD ignition MSD Distributor Blaster 3 Coil Electric Fan Underdrive Pullies T5 Trans Hurst Shifter Lowered 1.5" 373 Gears

02-14-2005, 07:09 PM	#2
Fat0eknee I'm slow ...I know. Join Date: Dec 2003 Location: houston Posts: 518	Re: New Engine burning too much gas, Help. whats fuel pressure at now? i believe its supposed to be around 32 at idle

02-14-2005, 07:46 PM	#3
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: New Engine burning too much gas, Help. Your fuel pressure should be at 38psi with the vacuum hose off and should drop to the low 30's with it re-attached. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

02-15-2005, 08:56 AM	#4
NitroNixon Registered Member Join Date: Mar 2002 Location: DC Posts: 129	Re: New Engine burning too much gas, Help. I think my adjustable fuel pressure regulator took a dump on me. Whenever I try to adjust the pressure, my guage will rise to 33lbs and stop at that setting, even if I keep turn the screw on the regulator, then when I turn the screw in the opposite direction the pressure goes down. When I try to turn the pressure back up, it won't go higher than 33lbs. And to make matters worse, this is with the vacuum off, so now I really don't know where my fuel pressure is set at, because I'm trying to decide if the gauge is bad or the adj. regulator is bad. I do notice that after I tried to make the adjustments, my engine backfires when cold. __________________ 87 GT As of 2/1/06 650 DP Carb Crosswind Intake Edelbrock Performer Heads 97 Explorer Bottomend w/ B-303 Cam 1.7 Roller Rockers Flowtech Longtube Headers Flowtech H-Pipe MSD Black Wires MSD ignition MSD Distributor Blaster 3 Coil Electric Fan Underdrive Pullies T5 Trans Hurst Shifter Lowered 1.5" 373 Gears

02-15-2005, 10:46 AM	#5
Dark_5.0 Registered Member Join Date: Apr 2001 Location: Staging lane Posts: 4,337	Re: New Engine burning too much gas, Help. I would throw the stock one back on there and see if it helps. __________________ 92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim. 00' Lightning-Stock 88'CRX-13 second ego killer

02-15-2005, 04:52 PM	#6
NitroNixon Registered Member Join Date: Mar 2002 Location: DC Posts: 129	Re: New Engine burning too much gas, Help. Yeah, I was thinking the same thing. I'll try that. __________________ 87 GT As of 2/1/06 650 DP Carb Crosswind Intake Edelbrock Performer Heads 97 Explorer Bottomend w/ B-303 Cam 1.7 Roller Rockers Flowtech Longtube Headers Flowtech H-Pipe MSD Black Wires MSD ignition MSD Distributor Blaster 3 Coil Electric Fan Underdrive Pullies T5 Trans Hurst Shifter Lowered 1.5" 373 Gears

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