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My 2¢, I ran a few (low pressure) electric fuel pumps before switching to a Sniper system with an in-tank pump. By far the quietest pump I ran was a Holley HP 125. I also understand that the carter pumps are relatively quiet. The noise from the popular diaphragm and vane-style pumps will...

Update: I have a spare parts carb that I was using to chase the air bleed circuits (just to get a better idea of where the circuitry originated and terminated). The primary bleeds on my parts carb where smaller than the one in the car so I decided to swap them. The result a slight enriching...

I wasn't really clear about this in my original post. I am on the edge of that surge with the current setup. It's getting just enough fuel that it's not completely falling on its face, but it wants to.

Yeah, I think richening the cruise up will be a good place to start. From some past fiddling, I remember a failed attempt at using Edelbrock metering rods that yielded awesome part throttle power but choked at WOT. It would have been delivering more fuel than my current setup at part throttle.

Hi All I am having this issue with a Thermoquad but assume that the method for addressing it is similar for any carb using metering rods. I have done some searching (maybe just not hitting the right keywords) and have not seen much on this topic. If there is a thread I have missed, please...

Well, I went ahead and put everything back together with the 1 1/2 body/ throttle plate. This leaned things out a bunch. In fact enough that I had to go back to my original jets. I might need to up a size yet depending on how lean I can live with my light cruise being at (~15.0 at the moment).

Hi All I have a Thermoquad (made from two parts carbs). When building the one good carb, I used the 1 1/2 throttle plate as it was in far better condition that the 1 3/8 plate. Not paying attention, I used the 1 3/8 bowl on this combination (Looking back at this, both carbs had miss-matched...

Update- Added Edelbrock metering rods and some other missing OE rods (95 unique rods on the list now). Also corrected some jet sizes and rod dimensions.

Hi All I put this jet/ rod calculator together to help me better figure what affect a given rod or jet change on a thermoquad may yield. Primary calculations are relative to the jet/rod area difference. I know it is common to substitute Edelbrock rods for "stock" metering rods, at this time I...

I just installed a Holley HP125 to replace a Red pump. It is QUIET!!! There is just a slight hum when the engine is off, when it's on you can't hear it. My red pump in the same location could be heard over the engine at all times. To be honest, I had little hope that the HP125 would be...

Thanks, when I adjust the brass floats, I assume I measure to the top of the hump? High point of the float.

Is this brass float built right? It seems like the hump on the brass float should face up towards the top plate. I have only ever delt with nitrophyl floats.

Once it fired up and ran for a bit we shut it off, I can't remember why now. I checked the oil level mainly to make sure there was no sign of metal. The oil on the dipstick smelled of gas. The level was also up. When I pulled the pump off the inside of the housing was as clean as could be and...

It didn't, Just pushed gas into the engine.

Hi All I have ran an electric fuel pump in my car since about 15 minutes after the engine was fired for the first time. The reason was that the mechanical pump that was on the engine had a faulty diaphragm and pumped about 1/2 gallon worth of gas into the engine. When this happened i figured...

The Holley is a nice pump but can be abit loud. I didnt think i would mind the moise but it ended up driving me nuts. This is what I would suggest http://www.holley.com/12-125.asp

I have that exact same set up on my car. (even the adapter plate ) Flip the adapter plate over. Every thing will line up better.

Ok so I had a cheapo pos solenoid style fuel pump on my car. I finally have decided to upgrade to a Holley red pump (no i am not worried about the noise). I have 2 questions 1. Why does the pump have to be mounted as low as possible. 2. Where are you guys mounting these pumps to...

Anyone using a 3/8 fuel inlet in stead of the 5/16 one? If so where did you get the parts from ex. Napa, Summit,tubes n hoses. I see I can get stuff on the internet but would really like to not have to pay shipping on a 4 dollar part. The carb side of the fitting is a 5/8 -20 with Banjo seal.

I have the same issue. I just make sure the little lock thing is on the stop that lets the least amount of fuel go through. Then I put my head down but the filler and listen to make sure its not filling to quickly. I'm sure i look like an idiot when I fill my car up but I don't have gas running...

Thats exactly how I see it.

Hemitt, Im about 150 miles up I 25 form you (5000ft). I am running a 318 with a 850 CFM carb with great luck. It took me a while to get the stumbling to go away,but have had alot better luck than I did with my 650 cfm holley. Also i have a buddy wiht a very hot GM 350 running a 1000 cfm carb...

Is any one using a vented gas cap on thier olders cars. i have heard of people using them but have yet to see one or find what cap they are using. I have a 74 duster and id like get rid of the charcole canister and that extra vent line.

I am getting ready to install an electric fuel pump on my 74 duster. The instuctions for the pump strongly recomend a oil pressure shutoff switch. I guess this is so if the car stops running while the igniton is on the fuel pump will shut off. Is it worth it and what do you do about your stock...

Mechanical all the way. fact of the matter ,simple= long life and they work as long as the engine is running