Fuel rail problems

aj_johnson
A.J. Johnson
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Location: Pendleton OR
Join Date: 01/07/2011
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Rally Car:
88 Audi 80

aj_johnson

Fuel rail problems
March 30, 2014 02:21AM

Registered: 01/07/2011
Posts: 1,381

I've replaced all the injector seals with new, aligned the rail a couple of times, lubed all the seals with dielectric grease and the thing still leaks. Am I missing some super secret lube for the seals? The rail seems overly sensitive to being aligned square with the injectors, and the rail hardware was at best poorly developed. My calibrated eyeball says its square now, and it seals for a little while but develops leaks as the car runs. Am I still misaligned or did I miss a step? Any tips?

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john vanlandingham
John Vanlandingham
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Location: Ford Asylum, Sleezattle, WA
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Saab 96 V4

john vanlandingham

Re: Fuel rail problems
March 30, 2014 02:25AM

Registered: 12/20/2005
Posts: 14,152

Quote
aj_johnson
I've replaced all the injector seals with new, aligned the rail a couple of times, lubed all the seals with dielectric grease and the thing still leaks. Am I missing some super secret lube for the seals? The rail seems overly sensitive to being aligned square with the injectors, and the rail hardware was at best poorly developed. My calibrated eyeball says its square now, and it seals for a little while but develops leaks as the car runs. Am I still misaligned or did I miss a step? Any tips?

How is it bolted, and to what?

John Vanlandingham
Sleezattle, WA, USA

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is 3 hours behind Eastern Standard Time.

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aj_johnson
A.J. Johnson
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Location: Pendleton OR
Join Date: 01/07/2011
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Posts: 1,381

Rally Car:
88 Audi 80

aj_johnson

Re: Fuel rail problems
March 30, 2014 02:47AM

Registered: 01/07/2011
Posts: 1,381

Uses two L shaped brackets to bolt to the valve cover. Seems everyone that has an internet account and an audi 10v has alignment issues with this setup

Not my car but a good illustration

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Pete
Pete Remner
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Pete

Re: Fuel rail problems
March 30, 2014 08:07AM

Registered: 01/11/2006
Posts: 2,022

Looks like it is not being held securely. The overhung mounting structure looks pretty bogus. 54psi (42psi plus 12psi boost) times maybe 1/3 square inch per injector times five injectors is 80 pounds of force lifting up on the rail against those cantilevered mounts.

I'll bear this in mind when I make mounts for mine. Bought on eBay with no mounts. But that's okay since it is going on an NG intake manifold which it wasn't designed for anyway!

Pete Remner
Cleveland, Ohio

1984 RX-7 (rallycross thing)
1978
Silence is golden, but duct tape is silver.

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aj_johnson
A.J. Johnson
Professional Moderator
Location: Pendleton OR
Join Date: 01/07/2011
Age: Settling Down
Posts: 1,381

Rally Car:
88 Audi 80

aj_johnson

Re: Fuel rail problems
March 30, 2014 11:03AM

Registered: 01/07/2011
Posts: 1,381

I've got the "new and improved" 034 rail.... I had it sealed nicely in the last car... This one is just not playing ball.