Fuel Pressure 101 - Mini-Diary Fuel Pressure Regulator Test Fuel Pump Test

newmab · 03-02-2007, 10:22 PM

Just got through pulling pump-regulator out of the tank on our 99 SOHC. Thought the FPR was bad, so I checked with Ford. It runs about $60. After studying the regulator is has nothing to do with holding pressure. I assume the pump takes care of that.
But after seeing this thread: http://www.explorerforum.com/forums/...=fuel+pressure
I did a little testing and found the factory clamps to be loose and the rubber hoses between the pump-regulator-outlet tube were deteriorated.

I'll replace the hoses in the morning and let you know the out come.

BTW, the issue I had was the vehicle was hard to start. Hot or cold. Unless you turned the key off-on a few times to cycle the pump. Fuel pressure when tested was 10 PSI after cycling twice KOEO. When I fired her up she sat at about 56 PSI.

newmab · 03-03-2007, 05:24 PM

Fixed the problem! Fuel injection rubber fuel line and some good clamps.
Pressure comes up to 55 PSI KOEO. Sits at 60 PSI running.
Over the past few hours pressure has settled to 55 PSI.

Ultimatar · 09-25-2007, 08:43 AM

I've been getting engine hesitation which is usually followed by the Check engine light. It happens randomly anytime during operation (just idling at a red light or on the freeway) and the light isn't constant, it will go off somtimes after a few seconds or several long minutes.
At first it felt like the truck was misfiring and I did a tune up changing the plugs, wires and the Oxygen sensor, but after paying for all that I still had the same engine difficulties. It shouldn't be timing either as the head gasket was replaced a few thousand miles ago. My Explorer is a manual 5-speed, which got a rebuilt tranny in 2005, so we've ruled out transmission problems also.
This Explorer, of mine, has 122k miles (just rolled over yesterday) Since the FRP also concerns emiisions I was assuming it would trigger the "Check" light. Since the light only activates after I feel the engine falter could it be something else? If it is a bad FRP is it seriously bad to continue driving until I can get it repaired.
I really appreciate any help here

**BrooklynBay** · 09-25-2007, 08:57 AM

Welcome to this forum! Have the code read before replacing anything else.

Rgam · 01-31-2008, 10:35 AM

I have a 05 Explorer 4.0 V6 Flex Fuel with P0172 and P0175 codes showing. I replaced the MAF sensor and gave it a tune up with no change. I'm looking at the FPR next. I called Ford to get a price on this and they told me I have Fuel Pressure Senor and not a FPR. Can anyone tell me where this might be located.

Thanks

cuervo513 · 02-29-2008, 02:47 PM

Is it possible to clean the fuel injectors through the schrader valve? I think this is how some of the tune up shops do this and charge $100. What tools and supplies would be needed for this?

**BrooklynBay** · 03-01-2008, 09:06 PM

3M, and OTC make an injector cleaning kit. Kem, and OTC sell cans of special cleaner which require this kit.

*JCUZ* · 11-14-2008, 06:05 AM

I know this is an oldie, but am searching in vain for answers. So, does anyone know what value is sent back the ECU when the fuel pressure is in range on a 2003 Explorer (V8, if that matters)? ie is it a resistance reading, or volts etc? And what values? Thanks in Advance.

Matthew martin · 03-22-2009, 06:04 PM

Alright.My truck will not crank. I just replaced the fuel pump and so it should be getting the right pressure. When u hook up the pressure gauge can it be done without running the vehicle for a week or two.

**BrooklynBay** · 03-22-2009, 07:24 PM

Cranking the engine is related to the starter, and it has nothing to do with the fuel pump since the pump is electrical, and not mechanical.

wildcat65gt500 · 04-04-2009, 09:00 PM

Ok so I am getting 24psi out the shrader valve with the engine on. Just dropped the tank to replace the pump but forgot to check the FPR. Is there a way to test it without puting the tank back in?

**BrooklynBay** · 04-04-2009, 09:26 PM

Connect the fuel lines with the tank on the floor.

Eddie V · 09-11-2010, 10:55 AM

I know you can get the individual parts at Actron, such as fittings, for different vehicles. I needed a ford adapter and couldnt find one until I went to Actron. ( I lost the one that came with the fuel pressure test kit)

MrShorty · 11-18-2011, 10:13 AM

For those with '91-'95 EEC-IV, Roadrunner777 just posted this pic showing which lead in the self-test connector to ground to manually get the fuel pump to run. Wanted to post a link to the post here for future reference.

http://www.explorerforum.com/forums/...37&postcount=8

snowing · 04-25-2012, 11:30 AM

New to site, not that familer with fords . I have 05 RANGER WITH A 4.0 that stars then stops fuel pressure is over 60 psi during the short time that it runs, pcm has no codes fuel quanity seems ok any ideas? thanks!!

RMR Motorsports · 09-04-2012, 05:22 PM

Has anyone ran an aftermarket FPR that is adjustiable ? found some on ebay and thought that it would help with WOT seems when get to certain throttle position that all she's got.

Thought with all the upgrades that needed more fuel ? any thoughts or answers on this thanks.

panton65 · 04-02-2013, 02:54 PM

Wow thanks fellows and very old very helpful thread again thanks

panton65 · 04-02-2013, 02:58 PM

Thanks fellows

03-02-2007, 10:22 PM	#21
newmab Wannabe Elite Explorer Fair Grove, MO 97 Sport & 99 Eddie Bauer Join Date: Nov 2006 Posts: 31 Vehicle Specs	fuel pressure bleed off Just got through pulling pump-regulator out of the tank on our 99 SOHC. Thought the FPR was bad, so I checked with Ford. It runs about $60. After studying the regulator is has nothing to do with holding pressure. I assume the pump takes care of that. But after seeing this thread: http://www.explorerforum.com/forums/...=fuel+pressure I did a little testing and found the factory clamps to be loose and the rubber hoses between the pump-regulator-outlet tube were deteriorated. I'll replace the hoses in the morning and let you know the out come. BTW, the issue I had was the vehicle was hard to start. Hot or cold. Unless you turned the key off-on a few times to cycle the pump. Fuel pressure when tested was 10 PSI after cycling twice KOEO. When I fired her up she sat at about 56 PSI.

03-03-2007, 05:24 PM	#22
newmab Wannabe Elite Explorer Fair Grove, MO 97 Sport & 99 Eddie Bauer Join Date: Nov 2006 Posts: 31 Vehicle Specs	fuel pressure bleed off Fixed the problem! Fuel injection rubber fuel line and some good clamps. Pressure comes up to 55 PSI KOEO. Sits at 60 PSI running. Over the past few hours pressure has settled to 55 PSI.

09-25-2007, 08:43 AM	#23
Ultimatar Wannabe Elite Explorer San Jose, California '92 Explorer XLT Join Date: Sep 2007 Posts: 1 Vehicle Specs	Might my problem might be FRP related? I've been getting engine hesitation which is usually followed by the Check engine light. It happens randomly anytime during operation (just idling at a red light or on the freeway) and the light isn't constant, it will go off somtimes after a few seconds or several long minutes. At first it felt like the truck was misfiring and I did a tune up changing the plugs, wires and the Oxygen sensor, but after paying for all that I still had the same engine difficulties. It shouldn't be timing either as the head gasket was replaced a few thousand miles ago. My Explorer is a manual 5-speed, which got a rebuilt tranny in 2005, so we've ruled out transmission problems also. This Explorer, of mine, has 122k miles (just rolled over yesterday) Since the FRP also concerns emiisions I was assuming it would trigger the "Check" light. Since the light only activates after I feel the engine falter could it be something else? If it is a bad FRP is it seriously bad to continue driving until I can get it repaired. I really appreciate any help here

09-25-2007, 08:57 AM	#24
BrooklynBay Aerostar Forum Moderator Brooklyn, NY 88 89 93 95 96 Aerostars Join Date: Nov 2005 Posts: 45,685 Vehicle Specs	Welcome to this forum! Have the code read before replacing anything else. __________________ My list of useful threads. My photo gallery. My product reviews. My list of items for sale. Aerostar owners thread. Aerostar parts work in Explorers, Rangers, and Bronco II thread. History of the Aerostar thread. Aerostar Forum. New Members Forum. Ford/Lincoln/Mercury Forum.

01-31-2008, 10:35 AM	#25
Rgam Wannabe Elite Explorer 05 Explorer 4.0 Flex Join Date: Jan 2008 Posts: 2 Vehicle Specs	05 Explorer Fuel Pressure Sensor Location I have a 05 Explorer 4.0 V6 Flex Fuel with P0172 and P0175 codes showing. I replaced the MAF sensor and gave it a tune up with no change. I'm looking at the FPR next. I called Ford to get a price on this and they told me I have Fuel Pressure Senor and not a FPR. Can anyone tell me where this might be located. Thanks

02-29-2008, 02:47 PM	#26
cuervo513 Wannabe Elite Explorer gainesville, fl 99 xlt Join Date: Feb 2003 Posts: 10 Vehicle Specs	Cleaning injectors through schrader valve Is it possible to clean the fuel injectors through the schrader valve? I think this is how some of the tune up shops do this and charge $100. What tools and supplies would be needed for this?

03-01-2008, 09:06 PM	#27
BrooklynBay Aerostar Forum Moderator Brooklyn, NY 88 89 93 95 96 Aerostars Join Date: Nov 2005 Posts: 45,685 Vehicle Specs	3M, and OTC make an injector cleaning kit. Kem, and OTC sell cans of special cleaner which require this kit. __________________ My list of useful threads. My photo gallery. My product reviews. My list of items for sale. Aerostar owners thread. Aerostar parts work in Explorers, Rangers, and Bronco II thread. History of the Aerostar thread. Aerostar Forum. New Members Forum. Ford/Lincoln/Mercury Forum.

11-14-2008, 06:05 AM	#28
JCUZ Elite Explorer Canberra, Australia 2004 XLT 4x4 Join Date: Sep 2007 Posts: 1,126 Vehicle Specs	I know this is an oldie, but am searching in vain for answers. So, does anyone know what value is sent back the ECU when the fuel pressure is in range on a 2003 Explorer (V8, if that matters)? ie is it a resistance reading, or volts etc? And what values? Thanks in Advance. __________________ 2004 Explorer Limited 7 seater, LPG SVI powered 4.6L V8, 4WD (with BWM 2WD coming), Auto, Lukey mufflers, Roof mount DVD system, HID driving lights (high beam)22s with 265/35/22 Atturo AZ800s

03-22-2009, 06:04 PM	#29
Matthew martin Wannabe Elite Explorer Eatonton,Georgia 1994 ford Explorer sport Join Date: Mar 2009 Posts: 8 Vehicle Specs	Fuel problem Alright.My truck will not crank. I just replaced the fuel pump and so it should be getting the right pressure. When u hook up the pressure gauge can it be done without running the vehicle for a week or two.

03-22-2009, 07:24 PM	#30
BrooklynBay Aerostar Forum Moderator Brooklyn, NY 88 89 93 95 96 Aerostars Join Date: Nov 2005 Posts: 45,685 Vehicle Specs	Cranking the engine is related to the starter, and it has nothing to do with the fuel pump since the pump is electrical, and not mechanical. __________________ My list of useful threads. My photo gallery. My product reviews. My list of items for sale. Aerostar owners thread. Aerostar parts work in Explorers, Rangers, and Bronco II thread. History of the Aerostar thread. Aerostar Forum. New Members Forum. Ford/Lincoln/Mercury Forum.

04-04-2009, 09:00 PM	#31
wildcat65gt500 Wannabe Elite Explorer 96 xlt Join Date: Dec 2008 Posts: 10 Vehicle Specs	Ok so I am getting 24psi out the shrader valve with the engine on. Just dropped the tank to replace the pump but forgot to check the FPR. Is there a way to test it without puting the tank back in?

04-04-2009, 09:26 PM	#32
BrooklynBay Aerostar Forum Moderator Brooklyn, NY 88 89 93 95 96 Aerostars Join Date: Nov 2005 Posts: 45,685 Vehicle Specs	Connect the fuel lines with the tank on the floor. __________________ My list of useful threads. My photo gallery. My product reviews. My list of items for sale. Aerostar owners thread. Aerostar parts work in Explorers, Rangers, and Bronco II thread. History of the Aerostar thread. Aerostar Forum. New Members Forum. Ford/Lincoln/Mercury Forum.

09-11-2010, 10:55 AM	#33
Eddie V Wannabe Elite Explorer Chicago 96 Eddie Bauer Join Date: Nov 2006 Posts: 23 Vehicle Specs	I know you can get the individual parts at Actron, such as fittings, for different vehicles. I needed a ford adapter and couldnt find one until I went to Actron. ( I lost the one that came with the fuel pressure test kit)

11-18-2011, 10:13 AM	#34
MrShorty Wannabe Elite Explorer Spanish Fork, UT 92 XLT and '87 Bronco II Join Date: Dec 2001 Posts: 4,934 Vehicle Specs	For those with '91-'95 EEC-IV, Roadrunner777 just posted this pic showing which lead in the self-test connector to ground to manually get the fuel pump to run. Wanted to post a link to the post here for future reference. http://www.explorerforum.com/forums/...37&postcount=8 __________________ Mr. Shorty 92 XLT 4x4 87 Bronco II XLT 4x4 '98 Chev K1500 Suburban SLT 4x4

04-25-2012, 11:30 AM	#35
snowing Wannabe Elite Explorer malone,ny 2 Join Date: Apr 2012 Posts: 1 Vehicle Specs	2005 ranger edge with a 4.0 won't run New to site, not that familer with fords . I have 05 RANGER WITH A 4.0 that stars then stops fuel pressure is over 60 psi during the short time that it runs, pcm has no codes fuel quanity seems ok any ideas? thanks!!

09-04-2012, 05:22 PM	#36
RMR Motorsports Wannabe Elite Explorer Kingman AZ 92 Ford Explorer XLT 4X4 Join Date: Mar 2012 Posts: 69 Vehicle Specs	Has anyone ran an aftermarket FPR that is adjustiable ? found some on ebay and thought that it would help with WOT seems when get to certain throttle position that all she's got. Thought with all the upgrades that needed more fuel ? any thoughts or answers on this thanks.

04-02-2013, 02:54 PM	#37
panton65 Wannabe Elite Explorer Join Date: Feb 2013 Posts: 2 Vehicle Specs	Wow thanks fellows and very old very helpful thread again thanks

04-02-2013, 02:58 PM	#38
panton65 Wannabe Elite Explorer Join Date: Feb 2013 Posts: 2 Vehicle Specs	Still very old and still great info Thanks fellows