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By Melly - 7 Years Ago
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My recently purchased 55 crown has both a stock pump and electric pump. Can they be run together? When power to electric pump stops, can the stock pump still pull fuel through the electric pump? Should pumps each have there own fuel line. What would be the proper way to run these and wire them? Help Please winter is ending and was to get it on road safely. Snow bound for now
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By charliemccraney - 7 Years Ago
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This arrangement is usually used to prime the carb before starting. That way you don't have to let the engine crank and crank and crank to fill up the fuel bowls after sitting.
Many electric pumps can be used inline with a mechanical pump. If the one you have cannot, then you simply add a T near the tank with one line going to the mechanical pump and the other going to the electric pump then to a T after the mechanical pump.
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By Talkwrench - 7 Years Ago
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You will need an Airtex electric pump as they can still pass fuel through them. I have one that I mounted in the engine bay on the fender wall both my [56 and 35 pickup]. It's used as a priming pump but I guess in a pinch it could still run if there is a failure to the manual pump.
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By 2721955meteor - 7 Years Ago
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i have installed several etc pumps on friends cars and the mechanical pump pulls threw the elect . i also use a backup light switch so they must hold the button ,which makes it safe,other wise runs all the time,not good. the elect has a check have 1 way so does not interfere with mechanical 1.
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By Melly - 7 Years Ago
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Thanks for your response's.
Would it be wise to put a pressure regulator on the fuel line? If so would it be ok to put before the stock pump?
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By 2721955meteor - 7 Years Ago
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no
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By charliemccraney - 7 Years Ago
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You only need a regulator if the pump provides more pressure than required. If you need on, it should be just before the carburetor.
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By DANIEL TINDER - 7 Years Ago
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2721955meteor (2/28/2018)
i have installed several etc pumps on friends cars and the mechanical pump pulls threw the elect . i also use a backup light switch so they must hold the button ,which makes it safe,other wise runs all the time,not good. the elect has a check have 1 way so does not interfere with mechanical 1.
If the mechanical pump fails when far from home, you might find that continually holding down a momentary switch while driving would likely prove rather inconvenient. But, since modern vehicles using electric fuel pumps have safety devices that switch off the supply of gasoline (in case of collision) even though the ignition is still powered, adding a warning light to the toggle switch might be helpful for those of us who’s memory is not what it used to be. Of course, if the mechanical pump’s diaphragm fails and a continuously running inline elect. pump floods the crankcase with gas, at best you will probably end up with severe bearing issues (?).
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By Florida_Phil - 7 Years Ago
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When I first purchased my '55 TBird, I crawled under it and found an electric fuel pump. Why it was there I'll never know. I have seen some people install an electric pump to overcome dirt in the fuel or a vapor lock issue. This fixes the symptom of the problem, not the real issue. I can see no reason why anyone would need both pumps on a stock Y Block when the stock pump has worked for over sixty years! I removed the electric pump and put it back the way Ford built it and it works just fine.
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By 2721955meteor - 7 Years Ago
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a 55 bird with the old style holley carb runs dry due to evaporation if stored for even 1 week. the elect pump saves on starters and gives you instant starts on any lengthy storage. works great
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By tbirddragracer - 7 Years Ago
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Vapor lock has returned as a problem for the little birds, an electric fuel pump will keep fuel flowing to the engine.
The primary reason for vapor lock is the fuel composition, heat build up under the hood, and altitude.
Ask some of the bird owners that made the trip to the Albuquerque, New Mexico regional a couple of years ago about this.
I was advised by the locals not to use premium fuel as it vapor locked more easily than regular.
An electric pump on my vehicle would have been an asset.
Ernie Phillips
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By DANIEL TINDER - 7 Years Ago
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I would have thought the opposite, since the vapor pressure of regular gasohol (as opposed to premium fuel) is reputed to be problematic (?).
This discussion brings up another issue that needs to be resolved: namely whether cranking longer allows the buildup of oil pressure before the impact of explosive combustion forces can damage dry bearings. In other words, is it cheaper to frequently rebuild/replace starters & flywheels than main/rod bearings (and engine blocks when they fail)?
50s 6V cars indeed did not really need elect. fuel pumps since they were typically started daily. The problem of hot teapot carbs going dry during storage likely never surfaced until they became seldom-used classics. Daily drivers rapidly accumulated mileage, and often went to the junkyard before the carburetor obviously needed rebuilding.
I suspect the day will come when Phill regrets removing that elect. pump, since it is human nature to eventually lose interest in performing all the maintainance required to keep an antique car in top running condition, and the smallest thing can leave you stranded unexpectedly.
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By Florida_Phil - 7 Years Ago
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Makes sense. I didn't know that. I never kept a teapot Holley on my cars any longer than it took to open the hood.
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By KULTULZ - 7 Years Ago
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Well, not only is vapor lock a problem with today's gasoline but also blend separation/lower boiling point (evaporation in fuel bowl) and atmospheric water vapor draw/retention due to the alcohol content.
Today's fuel is meant only for FI and EVAP equipped cars.
An electric fuel pump (carb model) is one way out.
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By miker - 7 Years Ago
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Maybe I’m just a nut case, but everything I’ve got that sits has an electric priming pump if they’re not a gravity feed on the fuel. All the little motors (like the chain saw and generator) get run dry at the end of the season. Turn the fuel on and prime, they start right up when the time comes. With the carb pretty much dry I haven’t seen a lot of problems with the ethanol fuel, but I don’t leave the tank full anymore either. Fresh fuel, prime, starting fluid if it’s a pull rope, and they light right off and go. The cars have ignition shut offs, and I crank them for oil pressure, then fuel with the electric pump and then start.
I used a booster pump on the RV on a regular basis for vapor lock. 12 mile, 6% grade, 85 degrees ambient, 4000 altitude, even rerouting and insulating the fuel line didn’t do it. The electric pump stopped it almost all the time.
It sounds like a lot to do, but you do it once, and in the garage. Better than on the side of the road or a parking lot.
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