QuickFuel 450 issues
Thread Starter
|
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
If an open plenum or the above gasket wouldn't, then I would think that just cutting it definitely wouldn't. 
The open plenum would mean that there's nothing against the PV port and it's open to a big open space.
The two hole gasket would effectively do the same as cutting it, and would only have a gasket between the primaries and secondaries, but not between the venturis on each side (where the PV port is).
Unless I'm missing something.
The open plenum would mean that there's nothing against the PV port and it's open to a big open space.
The two hole gasket would effectively do the same as cutting it, and would only have a gasket between the primaries and secondaries, but not between the venturis on each side (where the PV port is).
Unless I'm missing something.
Thread Starter
|
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Well, I haven't done anything with the gasket but I took a closer look at the power valve port and it looks like it would be really difficult for it to get blocked by a gasket.
The slot it's in is plenty deep. Not only that, but the screw head rises above the hole, so for anything to obstruct it would take something pretty serious.
I'll still look into it because I'm pretty desperate and frustrated, but wanted to throw that out there.
The slot it's in is plenty deep. Not only that, but the screw head rises above the hole, so for anything to obstruct it would take something pretty serious.
I'll still look into it because I'm pretty desperate and frustrated, but wanted to throw that out there.
Thread Starter
|
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
I've wondered that about the vacuum port. Maybe they just screwed up somewhere. The 450cfm size only came out last year.
I have thought about wishing I had another vehicle to try it on, but we sold my wife's Bronco almost a year ago, so the '81 is it. The open style intake went with it.
I have thought about wishing I had another vehicle to try it on, but we sold my wife's Bronco almost a year ago, so the '81 is it. The open style intake went with it.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Does that port have a check ball in it? I'll bet it does since that was a serious omission in the original Holley design. If it does have that check ball, might it be sticking? Does it seem loose in the carb?
Thread Starter
|
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Yes it does have the checkball. I've thought about that before too, with it getting stuck. I have no idea what I'd do about it though. Sprayed cleaner through it, and even hooked a vacuum pump up to one side to see if it was getting vacuum on the other, and it does.
However, a vacuum pump puts quite a bit of a different source of vacuum on it than high velocity air going through the venturis.
However, a vacuum pump puts quite a bit of a different source of vacuum on it than high velocity air going through the venturis.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Any chance of running a really small copper wire in to hold the ball off its seat? Maybe one strand of a finely-stranded wire. Gently push it in from the power valve side and, hopefully, past the ball and out the other end. You might have to turn the carb on its side to get the ball to move and let the wire pass.
If you can get it through, put a hook in the end so it won't go back down. But, if it does it won't hurt anything.
If you can get it through, put a hook in the end so it won't go back down. But, if it does it won't hurt anything.
Thread Starter
|
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Any chance of running a really small copper wire in to hold the ball off its seat? Maybe one strand of a finely-stranded wire. Gently push it in from the power valve side and, hopefully, past the ball and out the other end. You might have to turn the carb on its side to get the ball to move and let the wire pass.
If you can get it through, put a hook in the end so it won't go back down. But, if it does it won't hurt anything.
If you can get it through, put a hook in the end so it won't go back down. But, if it does it won't hurt anything.
Lead Driver
Joined: Mar 2008
Posts: 7,188
Likes: 384
From: Near Los Angeles
AB, I'm really sorry you're having that issue. I hope you resolve it quickly.
I'm thinking that both carbs had been taken apart and reassembled with aftermarket parts, right? Is it possible that maybe you used the wrong gasket, flipped backward, as one of the other members suggested?
It does sound as though a vacuum passage or ck ball is blocked or missing. It's too bad you didn't run the oem one for a while and test for that prob.
I'm thinking, after using 4x 600 cfm carbs, a 750 and 800 cfm QJ, and now a 1848, 465 cfm, that under 500 cfm is too small for a modded 300. I think with your new engine you'll find the same.
I'm thinking that both carbs had been taken apart and reassembled with aftermarket parts, right? Is it possible that maybe you used the wrong gasket, flipped backward, as one of the other members suggested?
It does sound as though a vacuum passage or ck ball is blocked or missing. It's too bad you didn't run the oem one for a while and test for that prob.
I'm thinking, after using 4x 600 cfm carbs, a 750 and 800 cfm QJ, and now a 1848, 465 cfm, that under 500 cfm is too small for a modded 300. I think with your new engine you'll find the same.
FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Anyway, I had to rebuild it many times and normally used Holley kits. But once I used a Standard Motor Products kit and suddenly the accelerator pump didn't work. Turns out the SMP gasket only had one hole for the pump's discharge, meaning that if you flipped it over the pump was blocked off. That was in March of 1975 and I still remember it.
Thread Starter
|
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
AB, I'm really sorry you're having that issue. I hope you resolve it quickly.
I'm thinking that both carbs had been taken apart and reassembled with aftermarket parts, right? Is it possible that maybe you used the wrong gasket, flipped backward, as one of the other members suggested?
It does sound as though a vacuum passage or ck ball is blocked or missing. It's too bad you didn't run the oem one for a while and test for that prob.
I'm thinking that both carbs had been taken apart and reassembled with aftermarket parts, right? Is it possible that maybe you used the wrong gasket, flipped backward, as one of the other members suggested?
It does sound as though a vacuum passage or ck ball is blocked or missing. It's too bad you didn't run the oem one for a while and test for that prob.
I'd wondered about the gasket, so when I got the second one, I took pictures as I took it apart to be sure everything was as it was supposed to be, and only took it apart to install it. It's fully OEM.
