Holley 4175 guys - quick, easy question
Thread Starter
Race Director
Joined: Mar 2008
Posts: 15,161
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From: coffee
Holley 4175 guys - quick, easy question
Does the stock fuel line from the pump line up with the fuel inlet?
I seem to recall conflicting reports on my reading on the subject here, nothing exactly on point.
Thanks.
I seem to recall conflicting reports on my reading on the subject here, nothing exactly on point.
Thanks.
Thread Starter
Race Director
Joined: Mar 2008
Posts: 15,161
Likes: 17
From: coffee
I'm not throwing in the towel on my Q-jet by any means, but I am considering my options should it not work well (engine just about ready to run). I'd love to spend the time to get the Q-jet right in any case, but that's just time I am not going to have. If there is a viable option "right out of the box", I'm going to consider it. Folks seem to have pretty good luck with these carbs.
Le Mans Master
Joined: Oct 2007
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From: RI, Now Franklin/Nashville TN
I am traveling for work through Friday so I cannot send you a picture-Send me a PM. The stock fuel line will NOT hook directly up to the 4175-You have to either cut the OEM line and install a short piece of rubber hose between the OEM line going into the 4175 and the rest of the line to the fuel pump (3-4 inches) or run a new line. I have had my 4175 on my L-82 since 1985 and it was much better than the Q-jet which is OK as long as it runs right but once the Q-jet goes south, good luck trying to correct the issue. In my opinion the Q-jet is way overly complicated for what it needs to do. It almost seems that GM was using a complicated carb in a crude attempt to precisely meter the fuel rather than use the more sophisticated/expensive mechanical fuel injection available at the time. I just rebuilt my 4175 in Dec 2010 and it was really easy after 25 years on the car. Try that with a Q-jet-rebuilding it and having run well for that amount of time!
Last edited by jb78L-82; Jun 14, 2011 at 09:27 PM.
Thread Starter
Race Director
Joined: Mar 2008
Posts: 15,161
Likes: 17
From: coffee
I am traveling for work through Friday so I cannot send you a picture-Send me a PM. The stock fuel line will NOT hook directly up to the 4175-You have to either cut the OEM line and install a short piece of rubber hose between the OEM line going into the 4175 and the rest of the line to the fuel pump (3-4 inches) or run a new line. I have had my 4175 on my L-82 since 1985 and it was much better than the Q-jet which is OK as long as it runs right but once the Q-jet goes south, good luck trying to correct the issue. In my opinion the Q-jet is way overly complicated for what it needs to do. It almost seems that GM was using a complicated carb in a crude attempt to precisely meter the fuel rather than use the more sophisticated/expensive mechanical fuel injection available at the time. I just rebuilt my 4175 in Dec 2010 and it was really easy after 25 years on the car. Try that with a Q-jet-rebuilding it and having run well for that amount of time!
I have tried to build hard line once, and never really had the time to progress beyond being terrible at it. Seems to me that with the right combination of fittings and filters, one might be able to make it work without the rubber hose (which I'd rather avoid if at all possible).
Thanks,
