7.3 help

Dirty_south_diesel_dmax · 05-06-2010, 08:57 PM

working on a 97 psd i hooked an fuel pressure gauge to it and the truck is only idealing at 10 psi. at WOT it goes to 8 psi. Truck fills like your pulling a danm d12 dozer until it gets to about 2500 rpm then does ok but still very laggy. Its got the factory fuel pump on it which i will be changing tommorw due to a leak. The pump thats going back on it will be a carter. Is there anything eles i can do. Also what should these trucks ideal at.

Blue01F250 · 05-06-2010, 09:41 PM

I don't know much about the fuel systems as I sold mine before I got to the fuel - but make sure all fuel filters are replaced.. I do know the the HPOP helps with oil pressure to fire the injectors.. not sure where the PSI come from or is read.. but I am sure someone around here will

04cumminsram · 05-08-2010, 12:15 AM

Airdog makes a pump that will replace both fuel pumps on it... id say 13-17 psi would be acceptable for fuel psi at idle !

Rsieck · 05-08-2010, 12:07 PM

Should idle about 6-700 rpms

Dirty_south_diesel_dmax · 05-08-2010, 02:41 PM

where is the other fuel pump at on the truck

04cumminsram · 05-08-2010, 09:15 PM

dont know man, honestly dont do anything to any ford either but if someone calls and wants to buy parts i sell them

Rsieck · 05-09-2010, 01:34 PM

On a obs the only pump I know of is in the valley

Blue01F250 · 05-12-2010, 03:40 AM

my 01 had a pump on the rail... I think

Slated4Greatness · 05-12-2010, 04:04 PM

As stated you will want to check the filter(s) first but the pressure should be more like 45+ at idle. My 02 ran 55-60 at idle.

Sounds like a fuel pump gone bad to me. They do make several replacements so your goals and budget would be the determining factor.

dieselwrencher · 05-12-2010, 07:43 PM

Have you had any luck with it?

Dirty_south_diesel_dmax · 05-17-2010, 07:20 PM

i did the hpop o rings and replaced the fuel pump. fuel pressure is low but seems to have alot more snap. but i still wanna get my fuel pressure right

diesel6.7 · 05-23-2010, 09:18 PM

fuel psi should be 45-65 psi on your obs... and fluctuate/bounce the fuel psi gauge while at idle.. the lift pump is in the valley of the motor, unless it has been modified.

Hopefully you get her figured out.. I have seen them run on low psi like this... try to get it fixed asap...

Dirty_south_diesel_dmax · 05-26-2010, 08:15 PM

truck runs about 7 psi and bouncing like hell but looks to run about 25@ 2,000 rpm. fuel pump is brandnew new fuel filter and all is well. can anyone give me more places to look please

diesel6.7 · 05-26-2010, 10:11 PM

fuel psi still is low... if you have a new pump on there... do you have an inlet restriction to the pump some how, restricting fuel flow...??

Blue01F250 · 05-27-2010, 10:38 AM

have you (does he need to?) do any in tank mods??

Slated4Greatness · 05-27-2010, 11:47 AM

IMHO you don't HAVE to do the in tank mods at this level but it may be worth looking at. The inlet may be damaged or blocked in some way. While you are there you can do the hutch and the tank mods.

Dirty_south_diesel_dmax · 05-27-2010, 02:42 PM

Quote:

Originally Posted by diesel6.7

fuel psi still is low... if you have a new pump on there... do you have an inlet restriction to the pump some how, restricting fuel flow...??

I checked that before i put the pump on and no i dont have no restricting on the pump that i could see

Dirty_south_diesel_dmax · 05-27-2010, 02:43 PM

Quote:

Originally Posted by Blue01F250

have you (does he need to?) do any in tank mods??

Where can i find these mods that u speak of. Also do i have to do it to both tanks i got dual tanks on my truck. I really appericate your guys giving me suggestions as to what it could be please keep them coming and ill check them out

Dirty_south_diesel_dmax · 05-27-2010, 02:45 PM

I just got back from work and i drive about 350 miles one way. I stay down during the week and get off on thursday to come back home. The truck never got over 7 psi and felt just like a dog. I try to pass someone and it took me 3 miles to get past them. This weekend is a long weekend so im hoping i can track it down before i head back down on monday night

05-06-2010, 08:57 PM	#1
Dirty_south_diesel_dmax Senior Member Join Date: Apr 2008 Location: Florida Age: 20 Posts: 146 Rep Power: 29	7.3 help working on a 97 psd i hooked an fuel pressure gauge to it and the truck is only idealing at 10 psi. at WOT it goes to 8 psi. Truck fills like your pulling a danm d12 dozer until it gets to about 2500 rpm then does ok but still very laggy. Its got the factory fuel pump on it which i will be changing tommorw due to a leak. The pump thats going back on it will be a carter. Is there anything eles i can do. Also what should these trucks ideal at. __________________ Mr Goodtime 1997 chevy 2500 5 ton running gear 40 inchs of lift 54 inch tires and slight motor modifcation Soon to have a duramax motor in it Mr Goodtime copilot ( Tailer Puller ) 1997 ford f350 flat bed stacks. FPR mod, cold air intake, Valair clucth Stock for now Soon to have a cummins motor in it

05-06-2010, 09:41 PM	#2
Blue01F250 Administrator Join Date: Jan 2008 Location: Ponca City, OK Age: 31 Posts: 5,874 Rep Power: 56	I don't know much about the fuel systems as I sold mine before I got to the fuel - but make sure all fuel filters are replaced.. I do know the the HPOP helps with oil pressure to fire the injectors.. not sure where the PSI come from or is read.. but I am sure someone around here will __________________ Brant 2003 Silverado LT CC SB LB7 Duramax 4x4 SOLD - 2001 F250 Lariat CC SB 7.3 PSD 2wd "Everyone is entitled to their own opinion, its just that yours is stupid." Click here for my Ford Parts Sale

05-08-2010, 12:15 AM	#3
04cumminsram Senior Member Join Date: Feb 2009 Location: Enid, OK Age: 28 Posts: 324 Rep Power: 20	Airdog makes a pump that will replace both fuel pumps on it... id say 13-17 psi would be acceptable for fuel psi at idle ! __________________ 2004 3500 SRW:Ats 2pc manifold, Silver Bullet, Flux 2.5's, Arson 2 Kit, Airdog 150, Smarty TNT-R, SBC 3850 DD fer/cer, S&B stg2, 7" Aussies, Leveled, H2's, Terra Grapplers, Debadged, Balanced and Blueprinted, CFM+, Grid Delete, Cool Twist Intercooler, Diprocal Optix Gauges in the pillar, Studs, and Springs... I cant think of anything else prob missed something... 625/1153 Thanks Adam www.smokinokiediesel.com

05-08-2010, 12:07 PM	#4
Rsieck Member Join Date: Oct 2009 Location: Marion Iowa Posts: 32 Rep Power: 0	Should idle about 6-700 rpms __________________ early 99 f250 4x4, built billet Goerend tranny, dp tuner (lame) might be on the verge of cracking 300 whopping hp..!!

05-12-2010, 04:04 PM	#9
Slated4Greatness Junior Member Join Date: Aug 2009 Location: Glendale AZ Posts: 29 Rep Power: 0	As stated you will want to check the filter(s) first but the pressure should be more like 45+ at idle. My 02 ran 55-60 at idle. Sounds like a fuel pump gone bad to me. They do make several replacements so your goals and budget would be the determining factor. __________________ -Dan 2006 Dark Slate F350 CC LB 6X6 Lariat Tow Boss Complete with training wheels so I don't tip over. SCT W/ID Tunes, Snow MPG H2O Injection kit, K&N Intake, Coolant filter, Train Horns, Recon smoked LED lights: Tail, Clearance, Center bumper, 3rd brake, Fat fender, Pressure pro TPMS, Firestone Ride rite bags, Alpine/Infinity/Polk sound system, Autometer Phantom EGT,Trans,Boost gauges above the rearview mirror. Muley, RIP 9-25-09 Keep on Honkin' Jerry RIP 04-05-10

05-08-2010, 02:41 PM	#5
Dirty_south_diesel_dmax Senior Member Join Date: Apr 2008 Location: Florida Age: 20 Posts: 146 Rep Power: 29	where is the other fuel pump at on the truck

05-08-2010, 09:15 PM	#6
04cumminsram Senior Member Join Date: Feb 2009 Location: Enid, OK Age: 28 Posts: 324 Rep Power: 20	dont know man, honestly dont do anything to any ford either but if someone calls and wants to buy parts i sell them

05-09-2010, 01:34 PM	#7
Rsieck Member Join Date: Oct 2009 Location: Marion Iowa Posts: 32 Rep Power: 0	On a obs the only pump I know of is in the valley

05-12-2010, 03:40 AM	#8
Blue01F250 Administrator Join Date: Jan 2008 Location: Ponca City, OK Age: 31 Posts: 5,874 Rep Power: 56	my 01 had a pump on the rail... I think

05-12-2010, 07:43 PM	#10
dieselwrencher Senior Member Join Date: Jul 2008 Location: Mitchellville, Ia Age: 29 Posts: 2,455 Rep Power: 35	Have you had any luck with it? __________________ Ryan- Low Budget Diesel Performance Mitchellville, Ia 515-250-5121 --------------------------------------------------- Thanks to our friends and family who have helped with the latest project. Without your help it wouldn't have gotten done before the snow flew. --------------------------------------------------- Ford, Chevy, Dodge, Parts Sales, Repair, Project Builds and Diesel Conversions 1968 Corvette Diesel Drag Car 2005 Dodge 3500 4x4 5.9 48RE Black Laramie 1976 Chevy K30 on 52's 1995 F-350 Crew Cab 4x4 soon to be cummins powered,collecting parts.

05-17-2010, 07:20 PM	#11
Dirty_south_diesel_dmax Senior Member Join Date: Apr 2008 Location: Florida Age: 20 Posts: 146 Rep Power: 29	i did the hpop o rings and replaced the fuel pump. fuel pressure is low but seems to have alot more snap. but i still wanna get my fuel pressure right

05-23-2010, 09:18 PM	#12
diesel6.7 Senior Member Join Date: Jan 2008 Location: phoenix Posts: 416 Rep Power: 33	fuel psi should be 45-65 psi on your obs... and fluctuate/bounce the fuel psi gauge while at idle.. the lift pump is in the valley of the motor, unless it has been modified. Hopefully you get her figured out.. I have seen them run on low psi like this... try to get it fixed asap... __________________ 97 f-250 4by4 7.3 DI, 2002 Excursion, Cummins powered, with 5R110 4by4 www.strictlydiesel.com

05-26-2010, 08:15 PM	#13
Dirty_south_diesel_dmax Senior Member Join Date: Apr 2008 Location: Florida Age: 20 Posts: 146 Rep Power: 29	truck runs about 7 psi and bouncing like hell but looks to run about 25@ 2,000 rpm. fuel pump is brandnew new fuel filter and all is well. can anyone give me more places to look please

05-26-2010, 10:11 PM	#14
diesel6.7 Senior Member Join Date: Jan 2008 Location: phoenix Posts: 416 Rep Power: 33	fuel psi still is low... if you have a new pump on there... do you have an inlet restriction to the pump some how, restricting fuel flow...??

05-27-2010, 10:38 AM	#15
Blue01F250 Administrator Join Date: Jan 2008 Location: Ponca City, OK Age: 31 Posts: 5,874 Rep Power: 56	have you (does he need to?) do any in tank mods??

05-27-2010, 11:47 AM	#16
Slated4Greatness Junior Member Join Date: Aug 2009 Location: Glendale AZ Posts: 29 Rep Power: 0	IMHO you don't HAVE to do the in tank mods at this level but it may be worth looking at. The inlet may be damaged or blocked in some way. While you are there you can do the hutch and the tank mods.

05-27-2010, 02:45 PM	#19
Dirty_south_diesel_dmax Senior Member Join Date: Apr 2008 Location: Florida Age: 20 Posts: 146 Rep Power: 29	I just got back from work and i drive about 350 miles one way. I stay down during the week and get off on thursday to come back home. The truck never got over 7 psi and felt just like a dog. I try to pass someone and it took me 3 miles to get past them. This weekend is a long weekend so im hoping i can track it down before i head back down on monday night

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode