fuel pressure isolator through firewall question
Thread Starter
Racer
Joined: Jul 2002
Posts: 313
Likes: 1
From: Dallas Tx
fuel pressure isolator through firewall question
Hi guys. I tried this over in forced induction, but didn't get any responses.
I know that this has been discussed in other posts (I did multiple searches) and to route wires through the firewall they say to use the hole behind the battery. Well, behind the battery there is the hole with 3 wires going through the firewall (black, green, etc) in a rubber grommet. Then there is the hole for hood latch. But I don't see any hole large enough to fit the steel braided line for the fuel pressure isolator through (let alone the hose for the boost gauge also).
I can drill a hole, but I am concerned about hitting something or drilling in the wrong location. If anybody has any pictures that would be tremondously helpful.
Question 2: Electrical wiring up the gauges. Which wires to I splice (colors if possible) into and where? Are any of the wires that connect to the mirror lights or map lights ones to splice into?
Oh, I drive a 94 corvette coupe, 6spd. Thanks again for all the help.
I know that this has been discussed in other posts (I did multiple searches) and to route wires through the firewall they say to use the hole behind the battery. Well, behind the battery there is the hole with 3 wires going through the firewall (black, green, etc) in a rubber grommet. Then there is the hole for hood latch. But I don't see any hole large enough to fit the steel braided line for the fuel pressure isolator through (let alone the hose for the boost gauge also).
I can drill a hole, but I am concerned about hitting something or drilling in the wrong location. If anybody has any pictures that would be tremondously helpful.
Question 2: Electrical wiring up the gauges. Which wires to I splice (colors if possible) into and where? Are any of the wires that connect to the mirror lights or map lights ones to splice into?
Oh, I drive a 94 corvette coupe, 6spd. Thanks again for all the help.
Burning Brakes
Joined: Jun 2003
Posts: 949
Likes: 0
From: smithtown ny
Re: fuel pressure isolator through firewall question (Scott94C4)
i have a 91 6spd i installed a fuel gauge in the car too and i ran the braided line in between the the front side of the door and the back of the battary there should be a a bunch of wires going through the side by the door
Thread Starter
Racer
Joined: Jul 2002
Posts: 313
Likes: 1
From: Dallas Tx
Re: fuel pressure isolator through firewall question (6spd)
forgot to mention that you will have to drill a hole but it is a little easy this way it was for me
Oh and thanks for the help. And do you have any advise on question 2?
Question 2: Electrical wiring up the gauges. Which wires to I splice (colors if possible) into and where? Are any of the wires that connect to the mirror lights or map lights ones to splice into?
[Modified by Scott94C4, 12:43 PM 11/28/2003]
Burning Brakes
Joined: Jun 2003
Posts: 949
Likes: 0
From: smithtown ny
Re: fuel pressure isolator through firewall question (Scott94C4)
hi, what i did was i drilled a small hole enough to get a coat hanger through just drill till you pop a hole now with the coat hanger stick it in the hole so that you can feel around inside the car and you can pretty much tell if theres any thing in the way as far as the wires black is the ground for the light the red i tapped into my parking light switch mine is a 91 so i dont know if the colors are the same but anyway when i turn my lights on it will light one more thing you have to tap into a wire that is hot in run position if you don't the light will stay lite all the time mine was a pink with a stripe but make sure. hope this helps let me know
Thread Starter
Racer
Joined: Jul 2002
Posts: 313
Likes: 1
From: Dallas Tx
Re: fuel pressure isolator through firewall question (6spd)
Thanks for all the help.
I just have one more question, sorry.
I need to extend my fuel pressure isolator line (doesn't quite reach, but it is really close). Can I just go buy stainless steel braided fuel lines and attach it to the fuel pressure isolator on the gauge side? I have the 6 ft of fuel line that came with the isolator, but it is just a tad too short.
If anyone can help with this question that would be great. It seems autometer is closed for the holiday weekend.
Thanks.
I just have one more question, sorry.
I need to extend my fuel pressure isolator line (doesn't quite reach, but it is really close). Can I just go buy stainless steel braided fuel lines and attach it to the fuel pressure isolator on the gauge side? I have the 6 ft of fuel line that came with the isolator, but it is just a tad too short.
If anyone can help with this question that would be great. It seems autometer is closed for the holiday weekend.
Thanks.
Burning Brakes
Joined: Jun 2003
Posts: 949
Likes: 0
From: smithtown ny
Re: fuel pressure isolator through firewall question (Scott94C4)
i bought the autometer 2 1/16 white face gauge with the 6ft braided line and i had enough line. the isolator is the small almost oval type it's not the one you mount to the firewall i ran it from the rail around my distrutor behind the ecm into the side of the door were i drilled the hole and i mounted the gauge right below the gauge cluster. the right side of the steering wheel on the panel with the carpet on it .
Thread Starter
Racer
Joined: Jul 2002
Posts: 313
Likes: 1
From: Dallas Tx
Re: fuel pressure isolator through firewall question (6spd)
i bought the autometer 2 1/16 white face gauge with the 6ft braided line and i had enough line. the isolator is the small almost oval type it's not the one you mount to the firewall i ran it from the rail around my distrutor behind the ecm into the side of the door were i drilled the hole and i mounted the gauge right below the gauge cluster. the right side of the steering wheel on the panel with the carpet on it .
Thanks for the help.
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Burning Brakes
Joined: Jun 2003
Posts: 949
Likes: 0
From: smithtown ny
Re: fuel pressure isolator through firewall question (Scott94C4)
do you have a local speedshop nearby you are going to have to get 1 male fitting and a 4ft hose i think the fitting you will need is a - 4 an. either an earls or russel fitting will do. i had my gauge mounted in a cup and i had 2 inchs of play it should work. were are you mounting it on your dash????
Thread Starter
Racer
Joined: Jul 2002
Posts: 313
Likes: 1
From: Dallas Tx
Re: fuel pressure isolator through firewall question (6spd)
do you have a local speedshop nearby you are going to have to get 1 male fitting and a 4ft hose i think the fitting you will need is a - 4 an. either an earls or russel fitting will do. i had my gauge mounted in a cup and i had 2 inchs of play it should work. were are you mounting it on your dash????
I believe it is a -4an fitting, but I am going to take my gauge in and test fit some fittings until I find the right one.
I am mounting the gauge on my a-pillar. That was the easy part. Doesn't anything go as planned when working on cars. :rolleyes: oh well. I should be able to get the braided stainless steel fuel lines and hook everything up today (after I get done with work).
Thanks again for all your help.
Burning Brakes
Joined: Jun 2003
Posts: 949
Likes: 0
From: smithtown ny
Re: fuel pressure isolator through firewall question (Scott94C4)
no problem one more thing i tryed to mount the gauge on my pillar and the pillar wouldn't sit flush because the braided line was to thick unless you plan on modifiying it. either way let me no how you made out.