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1991 f250 7.5l injector removal

 
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Old 04-15-2019, 02:09 PM
38Fitter
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1991 f250 7.5l injector removal

Can anyone give me some insight as to how to pull the passenger side injector closest to the front of the truck? Been making noise when reving over 3k, finally ran injector cleaner through it and now itís making an immense amount of noise whenever itís not idling. I ordered an injector cleaning apparatus that you pressurize and hook directly to the fuel rail, but Iím not so sure itís going to do the trick. Iíve got a trip I scheduled to go up north in beginning of May and I need to use my truck to tow my trailer, so Iíve got to have her running by then.

What is the easiest way to replace or just to pull that one injector? My manual says to pull the upper intake but Iím not sure why. Iím worried Iím about to open a can of worms...can any one give me some insight? Thanks.
 
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Old 04-15-2019, 03:04 PM
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The fuel injector on the passenger side closest to the front of my 1991 F250 7.5 is fully exposed. The manual says to pull the upper intake EXCEPT on the 7.5. Sandy


 
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Old 04-15-2019, 03:13 PM
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I first up my fuel raIL VERY CAREFULLY,. THEN i YANK THE INJECTOR STRAIGHT UP MAKING SURE THE CONE COMES WITH IT. USING NEW O-RINGS UP AND DOWN, PUT IN THE NEW INJECTOR,. CAREFULLY REPLACE THE FUEL RAIL.
 
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Old 04-15-2019, 03:36 PM
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Oh hell yeah. Thank you guys. So i do need to unbolt the entire fuel rail do just one though. If I end up replacing all of the injectors, can I just pick up some 24lb 4 hole injectors, unbolt fuel rail, remove old injectors, and pop in the new ones? Thereís no other sequence I need to do?
 
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Old 04-15-2019, 05:07 PM
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On my 89, my injectors were pretty tight in there, but I didn't have to dismantle too much to get them all out. I'm not sure I fully pulled the rail, think I just popped it up out of the way.
 
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Old 04-15-2019, 05:45 PM
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I usually just pull one side...penetrating oil helps alot to get rid of the old dried up o rings on the old injector. Yes, I usually change them out to multiports which is why it's so important to get the pintle cap fully out of the intake manifold.
 
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Old 04-15-2019, 06:29 PM
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Awesome thanks. This will be my first attempt at injectors on any vehicle, but it doesnít look too bad as these are all out in the open, and it sounds like I donít have to pull the upper intake manifold. The injector I think Iím having trouble with spins around pretty effortlessly, so hopefully they all pop out for me easy.

Are there any special tools I should have on hand to do this job?

Also, Iím pretty sure itís my injector, itís making a loud fwap fwap fwap that settles down at idle after a bit and gets loud when I rev it up. Can anyone comment if I should be looking at anything else? I hit it with my stethoscope and itís only coming from that one cylinder and is felt very strong in the fuel rail. Iím just hoping I didnít throw a rod or burn a valve.
 
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Old 04-15-2019, 06:35 PM
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Originally Posted by 38Fitter View Post
Awesome thanks. This will be my first attempt at injectors on any vehicle, but it doesnít look too bad as these are all out in the open, and it sounds like I donít have to pull the upper intake manifold. The injector I think Iím having trouble with spins around pretty effortlessly, so hopefully they all pop out for me easy.

Are there any special tools I should have on hand to do this job?

Also, Iím pretty sure itís my injector, itís making a loud fwap fwap fwap that settles down at idle after a bit and gets loud when I rev it up. Can anyone comment if I should be looking at anything else? I hit it with my stethoscope and itís only coming from that one cylinder and is felt very strong in the fuel rail. Iím just hoping I didnít throw a rod or burn a valve.
I wouldn't worry about that now you have an injector problem. Replace those and see what happens and go from there. Sandy
 
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Old 04-15-2019, 10:07 PM
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Thanks for the advice, changing oil tomorrow and then will pull injectors.
 
 


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