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| Wrong fuel prsure regulator? (Page 1/1) |
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jumpmonkey
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JUN 17, 10:59 AM
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Currently trying to resurrect an '85GT that has been sitting for some time. All the issues have been fuel related, so far. First was the pump and cleaning the tank. Now I'm on to the injectors. Sent them in to be cleaned/flow tested and every single one was clogged beyond repair. New ones on the way  The original fuel pressure regulator was also shot. That's my current issue.
I purchased this regulator from the ACDelco website. You can see in this snapshot that it claims to fit the 2.8. I've also seen this same part number on RockAuto so I was certain that it was correct.
I went to test fit everything today and the housing doesn't want to fully seat onto the rail with the regulator in place.
I've used a bit of pressure to see if the spring needs to compress but I can't get any movement out of it. There's about a 1/4" gap between the regulator housing and rail. The ring used to evenly supply pressure when bolted down is on the outside of the regulator, as it should be. I would assume that the regulator housing should just sit flush on the rail when the regulator is in there. I cannot think of any other issue than the regulator being wrong but I wanted to hear outside advice, first.
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olejoedad
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JUN 17, 11:37 AM
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Get some longer bolts of the correct thread and use them to draw the assembly down, then reinstall the original bolts.
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fierofool
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JUN 17, 11:41 AM
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The metal ring goes on top of the cover, not between the cover and diaphragm. It's used to spread the load on the thinner metal of the cover. There is a little turned up flange on the inner edge of the ring. With the ring underneath the cover, the cover will stand further away from the rail body. Can't tell how you've got it located on my little cell phone screen. [This message has been edited by fierofool (edited 06-17-2024).]
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jumpmonkey
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JUN 17, 01:16 PM
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| quote | Originally posted by olejoedad:
Get some longer bolts of the correct thread and use them to draw the assembly down, then reinstall the original bolts. |
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My fear is breaking this regulator by doing that. No matter how I push down on the housing, it will not sit flush on the rail.
Do you think that screwing it down with the bolts will bring it flush? I feel like it will just bind up or possibly crush the regulator.
| quote | Originally posted by fierofool:
The metal ring goes on top of the cover, not between the cover and diaphragm. It's used to spread the load on the thinner metal of the cover. There is a little turned up flange on the inner edge of the ring. With the ring underneath the cover, the cover will stand further away from the rail body. Can't tell how you've got it located on my little cell phone screen. |
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That's how I have it. The picture looks a little confusing, though 
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olejoedad
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JUN 17, 04:59 PM
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If everything is right, you're just compressing the spring in the housing, correct?
The 'longer bolt' method is an easy way to do that.
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sleek fiero
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JUN 17, 08:25 PM
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It is correct that the spring has some preload. I was worried about the same problem when I installed my Holley adjustable fuel pressure regulator. .With the Holley I could back off the adjuster screw and then use fuel pressure gauge to reset the pressure to 42lbs. sleek
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jumpmonkey
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JUN 18, 01:30 PM
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| quote | Originally posted by olejoedad:
If everything is right, you're just compressing the spring in the housing, correct?
The 'longer bolt' method is an easy way to do that. |
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Yup, that worked. I was unaware that the spring would need to somewhat compress into the housing. Tonight, or tomorrow, I'll reassemble everything. I think the faulty regulator and clogged injectors were the last piece of the puzzle for my no-start condition.
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Jumpmonkey
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olejoedad
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JUN 18, 11:43 PM
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