Bleeding fuel system

RJC · 05-21-2010, 04:33 AM

I have a 1993 5.9 3500 and I am new to diesel engines I changed out my fuel filter not knowing that I should have primed the new filter before I installed it. I have air trapped in the system and needing to know the best way to bleed the system. When I crank the engine it tries to fire up but cuts right out. Any suggestions would greatly be appreciated.

Thanks

JDolezal · 05-21-2010, 02:58 PM

Quote:

Originally Posted by RJC

I have a 1993 5.9 3500 and I am new to diesel engines I changed out my fuel filter not knowing that I should have primed the new filter before I installed it. I have air trapped in the system and needing to know the best way to bleed the system. When I crank the engine it tries to fire up but cuts right out. Any suggestions would greatly be appreciated.

Thanks

Well did you prime the pump by the manual lever on the lift pump? if not do that. Your gonna need to crack your injector lines loose to bleed it, But i can not remember if it's all of them or the first one. (I'm sure someone else will chime in) Then start it. It's going to run like crap for a minute, but then as the air comes out of the fuel system tighten the back down. I know it sounds weird to hear but makes much more sense when you see it done.

Philip · 05-21-2010, 03:43 PM

There are two steel lines on the fuel filter assy. The line closest to the injection pump has what looks like a small bolt in it. Loosen that small bolt about 1 turn. Then pump the lever on the side of the lift pump. When you see clear fuel coming from the bleeder screw. Tighten it back up. Pump the lever a few more times till your feel the lever getting hard to move. Lock the lever back into the upward postion. Then try to start the truck. You might get lucky.

If it doesn't stay running. Crack the 1st three injectors lines loose. Spin the engine over. As you see the injectors lines throwing high pressure fuel. Tighten them back up. Have the engine spining while your doing this. By the time you have the 3rd line tight. The engine should be running. If it is missing. Loosen the other lines off one at a time. Tighten them as you see high pressure fuel flow.

Leave #6 cylinder till last. If the engine isn't missing leave it alone. That one will oil the windshield down.

RJC · 05-21-2010, 03:44 PM

Yes I did prime the level on the pump and opened the low pressue vaule as suggested in the manuel. So should I go ahead and crack all the injector lines and try to fire up while it is cracked then tighten after all air is out?

Thanks

JDolezal · 05-21-2010, 03:50 PM

just crack the first one loose and she if it will run.....If if keeps running rough do the others also. I can't remember for sure If its the cummins or the old IH tractor engines that you need to crack all of them on.

RJC · 05-21-2010, 03:52 PM

Hi Phil,

I just saw your reply just as I when I was responding to JDolezal. I did the lever prime and lossen the low pressure valve. I will try and loosen the 1st 3 injectors. Since I am here alone would I be able to crank and let air out then tighten down or would I need a second body to keep it cranking as I tighten?

Thanks

RJC · 05-21-2010, 04:50 PM

I got her fired up. I did crack 3 lines, cranked it over unti i have fuel coming out, tighten them up and fired right up.

Thanks again for your replies.

Philip · 05-21-2010, 09:32 PM

Glad to hear is running.

05-21-2010, 04:33 AM	#1
RJC Junior Member Join Date: May 2010 Posts: 14 Points: 662 Thanks: 0 Thanked 0 Times in 0 Posts	Bleeding fuel system I have a 1993 5.9 3500 and I am new to diesel engines I changed out my fuel filter not knowing that I should have primed the new filter before I installed it. I have air trapped in the system and needing to know the best way to bleed the system. When I crank the engine it tries to fire up but cuts right out. Any suggestions would greatly be appreciated. Thanks

05-21-2010, 03:43 PM	#3
Philip Senior Member Join Date: Dec 2008 Posts: 434 Points: 11,328 Thanks: 0 Thanked 14 Times in 14 Posts	There are two steel lines on the fuel filter assy. The line closest to the injection pump has what looks like a small bolt in it. Loosen that small bolt about 1 turn. Then pump the lever on the side of the lift pump. When you see clear fuel coming from the bleeder screw. Tighten it back up. Pump the lever a few more times till your feel the lever getting hard to move. Lock the lever back into the upward postion. Then try to start the truck. You might get lucky. If it doesn't stay running. Crack the 1st three injectors lines loose. Spin the engine over. As you see the injectors lines throwing high pressure fuel. Tighten them back up. Have the engine spining while your doing this. By the time you have the 3rd line tight. The engine should be running. If it is missing. Loosen the other lines off one at a time. Tighten them as you see high pressure fuel flow. Leave #6 cylinder till last. If the engine isn't missing leave it alone. That one will oil the windshield down. __________________ 93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed

05-21-2010, 03:50 PM	#5
JDolezal Junior Member Join Date: Mar 2009 Location: Maybee, MI Posts: 97 Points: 2,909 Thanks: 22 Thanked 6 Times in 6 Posts	just crack the first one loose and she if it will run.....If if keeps running rough do the others also. I can't remember for sure If its the cummins or the old IH tractor engines that you need to crack all of them on. __________________ 91.5 Dodge 250, rclb, 4x4, Getrag, little extra fuel and timing, straight pipe 94 Dodge 2500, rclb, 4x4, NV4500, little extra fuel and timing, straight pipe 95 Dodge 2500, rclb, 4x4, auto, gasser. 02 Dodge 2500, rclb, 4x4, NV4500, Edge EZ, straight pipe

05-21-2010, 09:32 PM	#8
Philip Senior Member Join Date: Dec 2008 Posts: 434 Points: 11,328 Thanks: 0 Thanked 14 Times in 14 Posts	Glad to hear is running. __________________ 93 W350 w/duals, fuel pin turned, 6X.018" injectors, 4" exhaust, 3" air intake horn, HX40/16, G56 /SBC Con-OFE, 307's axles' 2" skyjacker lift, B&W flatbed

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05-21-2010, 03:44 PM	#4
RJC Junior Member Threadstarter Join Date: May 2010 Posts: 14 Points: 662 Thanks: 0 Thanked 0 Times in 0 Posts	Yes I did prime the level on the pump and opened the low pressue vaule as suggested in the manuel. So should I go ahead and crack all the injector lines and try to fire up while it is cracked then tighten after all air is out? Thanks

05-21-2010, 03:52 PM	#6
RJC Junior Member Threadstarter Join Date: May 2010 Posts: 14 Points: 662 Thanks: 0 Thanked 0 Times in 0 Posts	Hi Phil, I just saw your reply just as I when I was responding to JDolezal. I did the lever prime and lossen the low pressure valve. I will try and loosen the 1st 3 injectors. Since I am here alone would I be able to crank and let air out then tighten down or would I need a second body to keep it cranking as I tighten? Thanks

05-21-2010, 04:50 PM	#7
RJC Junior Member Threadstarter Join Date: May 2010 Posts: 14 Points: 662 Thanks: 0 Thanked 0 Times in 0 Posts	I got her fired up. I did crack 3 lines, cranked it over unti i have fuel coming out, tighten them up and fired right up. Thanks again for your replies.

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