Mystery part on 425 fuel line

Old Dec 30, 2012 | 03:04 PM
  #1  
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Mystery part on 425 fuel line

There is a device located between the mechanical fuel pump and the Rochester 2 Jet carb. Both the inlet and outlet lines are leaking. I don't know what it is or what to do to correct the issue.

This is on a '65 Dynamic convertible. I had this same power plant in a '65 Dynamic 4 DHT when I was a teenager, and don't remember this part. It looks to be of the same material and color as the carb.
Old Dec 30, 2012 | 03:24 PM
  #2  
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I'm not much help, but a pic or two of the device might be helpful.

Is there a chance this is some kind of inline fuel filter? Or maybe some kind of old gimmick part that would ionize or magnetically change the fuels properties? You know, and old snake oil part?
Old Dec 30, 2012 | 03:40 PM
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By any chance, does it look lik this:



I'm not asking because its correct for your car; actually I think these were used on '66 cars equipped with Q-jets. But 47 years is a long time, so maybe one found its way in your car. Its called a "pulse reducer", needed as I recall because of a problem with early Q-jets flooding. Again, I know you said your car has a 2bbl, but can't think of what other "device" it might be.
Old Dec 30, 2012 | 03:42 PM
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Originally Posted by don71
I'm not much help, but a pic or two of the device might be helpful.

Is there a chance this is some kind of inline fuel filter? Or maybe some kind of old gimmick part that would ionize or magnetically change the fuels properties? You know, and old snake oil part?
I tried to post pictures. It didn't work. There must be something obvious I'm overlooking.
Old Dec 30, 2012 | 03:43 PM
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Originally Posted by aliensatemybuick
By any chance, does it look lik this:



I'm not asking because its correct for your car; actually I think these were used on '66 cars equipped with Q-jets. But 47 years is a long time, so maybe one found its way in your car. Its called a "pulse reducer", needed as I recall because of a problem with early Q-jets flooding. Again, I know you said your car has a 2bbl, but can't think of what other "device" it might be.
That looks like half of it. The threaded nipples are offset (one in, one out).
Old Dec 30, 2012 | 03:48 PM
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By the way, this is a very low mileage Olds, pretty unmolested as far as I can tell.
Old Dec 30, 2012 | 03:49 PM
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I think the pic just shows the top. Based on memory, it is as you describe. My guess is the pump was replaced, and the new one had this piece. Is it the later "crimped" style pump or bolted style pump (ie how the top is affixed)? As another posted suggested, a pic would help clarify things.

One solution is to buy another (not sure you can find one cheap, and since you don't need it...), or see if you can simply remove it and run the fuel line directly to the pump. You may need to "re-form" your line or bend a new one.

Last edited by aliensatemybuick; Dec 30, 2012 at 03:54 PM.
Old Dec 30, 2012 | 04:01 PM
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Originally Posted by aliensatemybuick
I think the pic just shows the top. Based on memory, it is as you describe. My guess is the pump was replaced, and the new one had this piece. Is it the later "crimped" style pump or bolted style pump (ie how the top is affixed)? As another posted suggested, a pic would help clarify things.

One solution is to buy another (not sure you can find one cheap, and since you don't need it...), or see if you can simply remove it and run the fuel line directly to the pump. You may need to "re-form" your line or bend a new one.
A line would have to be formed from the pump to the carb. The car ran extremely well with this setup, so I wouldn't mind replacing it. How does it work? Is soaking (cleaning) it an option?
Old Dec 30, 2012 | 04:09 PM
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Well, I am not sure why its leaking. Bascially its a diaphram (maybe THAT'S what's leaking?! If not, maybe it just needs tightening? Who knows?), and I think is supposed to "even out" pressure spikes from the pump which could overwhelm the early version needle valve as used in some (all?) '66 Q-jets. I really don't think it would serve a purpose for a 2 BBL, though I guess there'd be no harm either. FYI, the only one I see on ebay now is listed for $165, crazy (and a lot cheaper to bend a new line).

Also, what about my Q about the pump (crimped on or bolted on top)?

Last edited by aliensatemybuick; Dec 30, 2012 at 04:12 PM.
Old Dec 30, 2012 | 04:11 PM
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The one aliens has is nice a clean (where did you find a NOS one of those!) Here's a picture of a crusty one on a 1966 Toronado engine.

PC300131_zps05c4aed5.jpg

PC300132_zps4d2afeab.jpg

Does this confirm your car has the pulse reducer?
Old Dec 30, 2012 | 04:12 PM
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Is the leak at the fitting or around the diaphram?
Old Dec 30, 2012 | 04:14 PM
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The one I "found" was doing a google search, and it actually is from a current ebay auctiom. I actually do have a crusty one, but I wouldn't trust it, as the diapragm material that sticks out is "crumbly".
Old Dec 30, 2012 | 04:18 PM
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No. It doesn't look like that. I've tried to post pictures, but it isn't working. The leaks are at the fittings. I haven't tried tightening until I found out what I was messing with. It is not located anywhere near the pump, btw.

Last edited by DonVila; Dec 30, 2012 at 04:21 PM.
Old Dec 30, 2012 | 04:35 PM
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Hummm, after market fuel filter maybe? Would you want to try emailing one of us the photos and we could post it for you? If you want to try that your welcome to send me a PM with your email address. I prefer not to post personal email address in the threads.


John
Old Dec 30, 2012 | 05:01 PM
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Don, it looks like an aftermarket fuel pressure regulator to me. Can you read any of the writing on top of it? They were popular years ago with the thought you'd get better gas mileage if you reduced the pressure going to your carb. Yeah, I bought one when I was a kid and it only worked as long as I was trying to drive real careful and slow. I spent money on the silly thing, so I wanted to believe it worked.

So its up to you. If others agree that's what it is you can remove it or leave it in. Just make sure you've got the fittings tight so you don't have a fire.

2012_1230Oldsfuel0038_zps2d8302af.jpg

2012_1230Oldsfuel0030_zps57e6dda1.jpg

2012_1230Oldsfuel0034_zpsba01780c.jpg
Old Dec 30, 2012 | 05:16 PM
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First of all, thanks for your time and your input. I suppose I could/should remove and disassemble it - for curiousity, if nothing else. It could be it's leaked for years. I hadn't run the car for six months and had a hard time starting it. (Needed to pull it out so I could park the antique boat next to it). Poured a little gas in the carb, and it lit right up. That's when I noticed this problem.
Old Dec 30, 2012 | 05:19 PM
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Helping each other out is part of the hobby Let's see what other members think it is. If you get time to it would be interesting to see what's printed in the top of the doo dad!



John
Old Dec 30, 2012 | 05:30 PM
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is there a vacuum line connected to it?
Old Dec 31, 2012 | 02:30 PM
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From the pic, it appears to be an oscillation overthruster.
Old Dec 31, 2012 | 06:03 PM
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Originally Posted by aliensatemybuick
From the pic, it appears to be an oscillation overthruster.
so does that regulate the flux capacitor?
Old Dec 31, 2012 | 07:07 PM
  #21  
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turboencabulator bypass solenoid!

But, seriously, great call on the Milemaster FP Regulator

I was going to to state that it's not factory, as I have never seen one, and I have seen pretty much ALL the factory stuff of the era, and a lot of the experimental stuff. I was going to assert that the fuel line does not really look stock also. [Aside: Note that your distributor vacuum runs from manifold vacuum, same tap as the auto trans modulator...]

Being in the fuel line, there's not much more it can be but a pressure regulator or filter.
Old Jan 1, 2013 | 06:54 AM
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Originally Posted by coldwar
Milesmaster fuel pressure regulator.

http://www.ebay.com/itm/MILESMASTER-...778706&vxp=mtr

We have a winner! I got it cleaned up enough to read. It said Milemaster Regulator. Should I just eliminate it, or would a replacement have a value?

The line to the carb was replaced - the original got crimped when I changed the carb.

Last edited by DonVila; Jan 1, 2013 at 06:56 AM. Reason: more info
Old Jan 1, 2013 | 07:07 AM
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And thanks for the link, Coldwar

It would be easier to replace the part than to replace the whole line. So unless there's a reason not to, I should probably buy this.
Old Jan 1, 2013 | 08:25 AM
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Originally Posted by DonVila
Should I just eliminate it, or would a replacement have a value?
It's a voodoo scam that a lot of people wasted their hard-earned money on years ago.



Do you really think it will improve your gas mileage?
Or maybe interfere with fuel flow at high speeds?

Keep it on a shelf in the garage as a piece of automotive memorabilia.

- Eric
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File Type: jpg
MilesMaster Guarantee.jpg (70.6 KB, 151 views)
Old Jan 1, 2013 | 08:43 AM
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The car ran perfectly with it on. Very smooth acceleration. I don't care about fuel economy, would be mildly concerned about restriction at higher rpms, but never noticed any issues.

It's just a pretty simple in and out - rather than fashioning a metal line (which I don't have any tools for. It's not like it costs much of anything.
Old Jan 1, 2013 | 09:12 AM
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I go with the Keep It Simple philosophy. I avoid unnecessary parts, especially ones that could potentially restrict your fuel flow or leak highly flammable fluid all over your engine while driving.

Every additional part on a car is an additional potential failure mode.

- Eric
Old Jan 1, 2013 | 01:23 PM
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Those fuel regulators worked fine on old Stromberg carbs that required less than 3lb fuel pressure... there was one that was vacuum regulated that allowed more fuel to pass thru under low vacuum WOT conditions.

If you remove that piece, and it's a Milesmaster, I'd be a buyer for $10.00 and I'll pay the shipping.

Last edited by krooser; Jan 1, 2013 at 01:27 PM.
Old Jan 3, 2013 | 06:10 AM
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My mechanic suggests caution

He thinks someone could have put a high capacity fuel pump in there and the regulator has an actually function. If that's the case, and I eliminate the regulator, I'll have a problem. It's probably not likely, but apparently Pat's seen it before. Again, it runs beautifully with this set up.

Krooser, you'd be welcome to the old one. PM me with appropriate info. No telling when I'll get it out, though.

Don
Old Jan 13, 2013 | 06:47 AM
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Sorting through the clutter Saturday and look what I found!

P1121123_zps0f74195d.jpg

P1121125_zps83f30b49.jpg

P1121127_zpsf35a6646.jpg
Old Jan 13, 2013 | 06:56 AM
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You've really got a little of everything packed away there, don't you, John?

Nice.

- Eric
Old Jan 13, 2013 | 06:58 AM
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Originally Posted by MDchanic
You've really got a little of everything packed away there, don't you, John?

Nice.

- Eric
I just need to be a little (LOT!) more organized
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