heres the deal, the car is stalling when I exit the freeway. I checked the fuel pressure. It is 40 with the vac line hooked up to the reg. When I shut the car down and let it set, the pressure drops to 0 in a few hours. Is this correct, and how do I fix it.

Jeremy

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92 Z conv
5-spd B&M shifter
home-made ram air, air foil, headers, no cat, TB bypass, kevlar pads, slotted rotors, BMR panhard, alston SFC
when it warms up Edelbrock STB maybe springs

 

i tihnk i'd be looking at the fuel regulator first. not 100% sure i'd read up on it a little in a manual for testing it. might be fuel pump, again check a manual to get the specs, but i think regulator.

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ICON Motorsports
1st & 3rd

 

other than the dying and a little rough idle, the car runs fine. does this still sound like the reg.?

Jeremy

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92 Z conv
5-spd B&M shifter
home-made ram air, air foil, headers, no cat, TB bypass, kevlar pads, slotted rotors, BMR panhard, alston SFC
when it warms up Edelbrock STB maybe springs

 

Sounds more like a fuel filter to me. And thats a lot cheaper to change, easier to no doubt. Chances are it's the original anyway.

 

And even if you are going to install a new regulator, you should always install a new filter to prevent trashing the new regulator with debris. So, you might as well do it first and get it out of the way. No one is going to think you've wasted your time if you're performing normal maintenance items - at least I won't.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

filter is just a yr old (replace all of them annually, call me ****) tonight the car ran fine, but I am still worried about the leak down. What is the normal rate of fall from shut off. It seems mine used to hold pressure all night.

Jeremy

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92 Z conv
5-spd B&M shifter
home-made ram air, air foil, headers, no cat, TB bypass, kevlar pads, slotted rotors, BMR panhard, alston SFC
when it warms up Edelbrock STB maybe springs

 

Jmon,

Theoretically, it should hold pressure forever. Mine holds for days.

The easiest thing to do to check leakdown is to block the regulator return line to the fuel tank. If you don't have the special Peterson Vise-Grip pliers with the rounded jaws made specifically for pinching off hoses, you can clamp the hose between two soft pieces of wood in a large 'C' clamp. Turn on the key briefly and watch the pressure gauge. If the pressure remains until the hose is released, the regulator is leaking through. If the pressure falls off immediately after the pump shuts off, the return line is not sealed or one or more of the injectors is leaking down.

Checking the injectors with an ohm meter for a 16_ resistance is not a valid test for flow nor leakage.

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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

Vader,
where is the rubber line? All I have found are the steel ones under the hood.

Thanks,
Jeremy

 

The rubber sections are on the driver's side - they are underneath plastic wire harness covers - just pull back the cover on the bottom (smaller) return line.

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89 Iroc-Z LB9 305 TPI auto 2.73 posi:
3" Dynomax "cat" back,K&N filters, TB bypass, 3" pipe in place of cat, cleaned and flow-matched injectors, 180' thermo, mild ignition mods, synthetic oil, kicker sound system, soon to attempt engine swap...

 

Jmon,

The lines are as I ROCK describes, shown just about in the center of the photo right behind the AC compressor:



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Later,
Vader
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"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

[This message has been edited by Vader (edited October 21, 2001).]

 

Ouch!!!!

I've been snakebit.

It was right under my nose the whole time.
Thanks everyone I will try blocking it off,
Jeremy

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92 Z conv
5-spd B&M shifter
home-made ram air, air foil, headers, no cat, TB bypass, kevlar pads, slotted rotors, BMR panhard, alston SFC
when it warms up Edelbrock STB maybe springs

 

still leaking down, if I sent the injectors to cruizin to get flow checked and stuff, would it solve my problem, or do I need new injectors?

sorry for all the trouble,
Jeremy

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92 Z conv
5-spd B&M shifter
home-made ram air, air foil, headers, no cat, TB bypass, kevlar pads, slotted rotors, BMR panhard, alston SFC
when it warms up Edelbrock STB maybe springs

 

Jmon,

Cruzin' Performance will do an excellent job for you. Keep in touch with Rich via email, and you should get a full report of before and after flows and spray patterns on your injectors. If you have any unrepairable injectors, Rich will likely have replacements available in the correct flows.

Once your injectors are returned, you should not have to worry about them for quite a while. It is important, however, to install a new filter and flush the rails/lines before installing the cleaned injectors.

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Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0

 

thanks Vader, I guess I will take them out and send them to 'em.

Jeremy

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92 Z conv
5-spd B&M shifter
home-made ram air, air foil, headers, no cat, TB bypass, kevlar pads, slotted rotors, BMR panhard, alston SFC
when it warms up Edelbrock STB maybe springs