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EFV-8 Club Forum / General Ford Discussion / fuel pressure

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Discussion Topic: fuel pressure -- page: 1 2 3

TomO

03-15-2014 @ 8:41 AM

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A fuel level that is too low will show up in turns and at high speeds as fuel starvation. The mixture will be very close to normal under slow straight driving.

The readings that I gave you are done while the engine is running. The engine stopped measurements can be lower.

If you are concerned about running lean, check your spark plugs after running the car for a sustained period at highway speed.

Here is a link to a chart for reading spark plugs.

http://www.ngksparkplugs.com/tech_support/spark_plugs/faqs/faqread.asp?mode=nml

Tom

johnmyron

03-13-2014 @ 9:19 AM

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USed your fuel level and go/nogo gauge information. Still seems to run better with a depth below gasket surface of 1" rather than 25/32. THis again is a Dennis Carpenter repro carb. Will it run too lean at this level and damage valves, etc? If it is too lean, will not run well, correct?

johnmyron

03-10-2014 @ 9:49 AM

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Thanks Again-practical and useful info

TomO

03-10-2014 @ 8:38 AM

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I use the shop manual for determining the correct fuel pressure. The needle valve can make a difference in how the fuel pressure affects fuel level. Most of the current ones will allow a pressure of up to 4 lbs.

All of the 94 type carburetors have the same fuel level. I personally like to set the fuel level 1/32" lower because of the alcohol in the fuel. If the needle valve has rubber parts, I like to set the level 1/16" to 3/32" lower to compensate for the softer close.

I made a float gauge out of 1" aluminum that sits flat on the housing. It has go and no go sides. The go side is 1.353" and the no go side is 1.322". I use it as is with the steel needle and use it with a new gasket if the needle valve contains rubber.

Tom

ken ct.

03-09-2014 @ 9:53 PM

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I set all my floats on 94's at 1 7/16" upside down w/steel needles [no gasket] and 1/8" float drop right side up. OMO ken ct.

johnmyron

03-09-2014 @ 7:25 PM

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Will this measurement also work on the carb for my 47? Suspect it runs a bit rich as well, although not as much as the 53

johnmyron

03-09-2014 @ 7:19 PM

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one other topic-many of the folks above are saying take the fuel pressure reg to 2 to 2.5 psi. Yet the shop manual states that when testing the conventional fuel pume, should show 3.5-4.5 psi at the carb inlet. Who is correct? Does it really make any diff? seems to run about the same at 2 or even 4 psi.

johnmyron

03-09-2014 @ 7:17 PM

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Thanks so much-exactly the kind of info I was looking for. Will do.

TomO

03-09-2014 @ 8:25 AM

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To get the best fuel level, use a fuel level gauge that fits in one of the drain holes.

If you do not have one available, run the engine and then take off the air horn and measure the distance between the gasket surface and the fuel. It should be between 23/32" and 25/32" with the rubber tip needle or the ball type valve and 21/32" - 23/32" with the steel needle valve.

The rubber type valves are not as consistent as the steel valves in stopping the flow of gas, so the lower level works better.

Tom

johnmyron

03-08-2014 @ 10:04 PM

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problem solved. To follow up on all your helpful suggestions, tried them all to no avail. Car seems to run rich as only neee the choke very briefly. Pulled a few plugs and found them carboned up, and suspected running too rich. Took the new Dennis carpenter carb apart and checked the float level. According to Ford measurements (which apparently have no meaning on this carb) the float was too low already making the carb lean. Lowered it some more and voila, the stumbling stopped, and acceleration is good. It was drowning not starving! How to optimize float level? Trial and error? exhaust gas analyzer?

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