Fuel pressure

Unfortunately, if you measured 10 new currently made pumps no matter who's label was on the box, you would probably get 10 different PSI readings. If yours is too high put in a regulator, if too low, don't use it or try rebuilding it. The valves are probably leaky.
 
deuce_roadster said:
Unfortunately, if you measured 10 new currently made pumps no matter who's label was on the box, you would probably get 10 different PSI readings. If yours is too high put in a regulator, if too low, don't use it or try rebuilding it. The valves are probably leaky.
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If Drake was selling them 30 years ago I believe that would be the age of mine. I just wondered if back in that time, they were made to put out 2-1/2 psi or less as Stromberg recommends.
 
deuce_roadster said:
Do you know what PSI it puts out?
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Not yet. I have not had any trouble with fuel supply. I read that Stromberg only wants 2-1/2 psi max. If I was to buy and install a new 97, just trying to find out if the older pumps were manufactured to fall into the correct range. Thought maybe I could save buying the equipment for just one time use. I guess I just may have to buy the Holley regulator and gauge which I would certainly do if necessary.
 
Mine was a drake bought about 10 years ago and I think it was a sale for 50.00. When I installed it I couldn’t hook up fuel lines due to the top not being indexed correctly which I fixed. Found a nice rebuilt ac pump on ebay for not a lot and it puts out 3 psi.
 
Two words (or maybe one) : "Charlie ny".

He may be "Banned" for some unimportant extra-curricular stuff, but he's still the best!
 
Charlie rebuilt the carb and fuel pump for my '46 Coupe, and when I got them back the pump was tagged "2 1/2 PSI". I fact, Charlie contacted me to ask if he could hold sending them back, as he wanted to use my pump to run a few carbs on his test engine. When I got them back, the carb and pump were switched out for the ones I was running, and the performance in starting, idling acceleration and fuel mileage was amazing.
 
not the time or place to go over this!! The question was to do with fuel pressure Stromberg did publish a chart that showed how to correct the fuel height according to fuel pressure but for ease of use fit a quality regulator as shimming the pump stand [as touted by some on here ] will also effect the the volume and therefore create another problem
 
aussie merc said:
not the time or place to go over this!! The question was to do with fuel pressure Stromberg did publish a chart that showed how to correct the fuel height according to fuel pressure but for ease of use fit a quality regulator as shimming the pump stand [as touted by some on here ] will also effect the the volume and therefore create another problem
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With respect----I would not want to clutter the engine compartment with a regulator and associated plumbing. I just want a pump that puts out 1-1/2 to 2-1/2 psi. Evidently most pumps are too aggressive. My original question was:

Did all of the Bob Drake fuel pumps have the same pressure and if so what was it? Probably an unanswerable question! The journey goes on and I keep learning as I proceed. Thanks to all for the help.
 
aussie merc said:
not the time or place to go over this!! The question was to do with fuel pressure Stromberg did publish a chart that showed how to correct the fuel height according to fuel pressure but for ease of use fit a quality regulator as shimming the pump stand [as touted by some on here ] will also effect the the volume and therefore create another problem
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I believe that you're a little sensitive. I still think a "Charlie" rebuild would be the best solution for this guy's problem. We're all here to help each other out the best way we can.
 
I agree with tubman and others. I have fuel pumps rebuilt by Charlie on my '34 and '37 Fords and neither required regulators.
 
IF YOU HAVE A PUMP THAT WAS WORKING & failed & you need to replace it. remove the big spring if not broken & put it in the new pump. the spring is what regulates the fuel pressure
 
Fuel pump pressure is controlled by the large spring under the diaphragm. I rebuilt the pump on my 33 using a new spring and found out it was putting out over 5 pounds of pressure and was overpowering the float level needle valve. Gasoline everywhere. Charlie NY advised I use my old spring which I did and wholla, I installed an in-line 0 to 5 lbs pressure gauge and mow I’m at 1 1/2 lbs pressure and the Stromberg is working just like Henry intended. Happy New Year to all of the Barners!
John
 
I just went through this on a 35 at a resent club run the 80 year plus gentleman was on the side of the road trying to clean his plugs ,after in the shop I tested the pump at 5lb ,A new glass bowl type with a slotted arm bush ?? . I had never seen this type ,I went through my stocks and got the best original pump I could re kitted it and all was well.
 

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FYI; Pressure is resistance to flow or volume. Excess volume is what creates back pressure and that pressure is preset/balanced by the pump spring.
The diaphragm is mechanically pulled down to charge the chamber but it's the spring that returns it and if there's a greater resistance or pressure it stalls accordingly.
A very simple yet effective system.
 
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