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Anyone use a solid state fuel pump?
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David_DuBois
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Bugeye58 said:
No. The all electronic fuel pump is far more sophisticated than just having a diode in it. There is a Hall effect circuit used for triggering a Field Effect Transistor, which in turn drives the coil (or solenoid) to operate the diaphragm. The same circuit board is used for both positive and negative ground, but there is one (or possibly two) connections on the board that have to be changed to get the proper polarity to the several polarity sensitive components on the board. Unfortunately, the one or two connections that need to be changed are not marked. Besides know which connections to change, one has to be somewhat proficient at soldering on a tow sided circuit board to make the changes without damaging the board.
Cheers,
I'm driving a 74.5 (rubber bumper) B-GT. Long story short, it was garaged in Dec. of 1984 by the previous owner and not driven until I finished a restoration last December. With approx. 100,000 miles on the original car, it already had an aftermarket, solid state fuel pump on board. The pump hadn't seen electricity for almost 20 years, but when I twisted the key - it sprang to came life. Unfortunately, the diaphragm was cracked and the company is history. Fotrunately, my parts car had a solid state SU knock-off with a good diaphragm. 2,000 miles later it still pushes fuel reliably.
As for the aftermarket local suppliers, I have two options here in coastal NC - Auto Zone and Advance Auto Parts. Both have them available, but Advance has the better price ( https://www.partsamerica.com/ProductDetail.aspx?MfrCode=PUR&MfrPartNumber=PRO04SV&CategoryCode=3339K ). Don't overlook Little British Car Company for a similar items https://www.lbcarco.com/
As for the aftermarket local suppliers, I have two options here in coastal NC - Auto Zone and Advance Auto Parts. Both have them available, but Advance has the better price ( https://www.partsamerica.com/ProductDetail.aspx?MfrCode=PUR&MfrPartNumber=PRO04SV&CategoryCode=3339K ). Don't overlook Little British Car Company for a similar items https://www.lbcarco.com/
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As an aftermarket alternative I have a Carter P60504 low pressure pump supplying twin DCOE Webers on the Spider. No issues with needle/seat or volume. It's meant to be a "lift" pump for FI systems but suits our low pressure needs well. Haven't tried it on an SU equipped engine yet but expect it will work reliably there too.
DCOE's are a 400CFM WOT each, BTW.
DCOE's are a 400CFM WOT each, BTW.
David_DuBois
Jedi Warrior
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That facet pump mounted to the back of the side curtain storage box without any sound mounts would probably exceed the noise ordinance of most cities.
"It's a common modification on TDs to put a pusher pump as a second pump in the system,"
In an article I am writing, titled "Protecting SU fuel pumps with a filter in the inlet line, and other myths." is the following:
Pusher and/or puller fuel pumps is a misnomer. Any SU fuel pump (or any other brand of pump), regardless of where is it intended to be mounted will generate 4 to 10 inHg of vacuum or more, sufficient to lift fuel 6 to 12 feet or greater. The low pressure SU fuel pumps, which are intended to be mounted in the engine compartment (and thus have been called "puller" pumps are actually less able to lift fuel as high as the later, high pressure ("pusher") pumps. Fletcher Millmore (a frequent contributor to the Bulletin Boards and Forums), states it very well when he says “No pump will ever pull fuel as well as it will push it – that’s physics, not pump design. All pumps will be slowed down by having to pull the fuel very far up, even within the rated inlet head for the pump.
Cheers,
"It's a common modification on TDs to put a pusher pump as a second pump in the system,"
In an article I am writing, titled "Protecting SU fuel pumps with a filter in the inlet line, and other myths." is the following:
Pusher and/or puller fuel pumps is a misnomer. Any SU fuel pump (or any other brand of pump), regardless of where is it intended to be mounted will generate 4 to 10 inHg of vacuum or more, sufficient to lift fuel 6 to 12 feet or greater. The low pressure SU fuel pumps, which are intended to be mounted in the engine compartment (and thus have been called "puller" pumps are actually less able to lift fuel as high as the later, high pressure ("pusher") pumps. Fletcher Millmore (a frequent contributor to the Bulletin Boards and Forums), states it very well when he says “No pump will ever pull fuel as well as it will push it – that’s physics, not pump design. All pumps will be slowed down by having to pull the fuel very far up, even within the rated inlet head for the pump.
Cheers,
R
RonMacPherson
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Facet also makes one for aircraft that is low pressure. If I remember properly, it's max is 2 1/2 psi. I found the best way to mount a facet(shopping around you can get them for under 40 easily) is with the rubber mounted studs that MB and Porsche used on their air cleaners about 20 years ago. Still available at any MB shop. Look like a little rubber biscuit appx. 1 inch high with a stud sticking out of each end. Drill holes for one side of the stud in whatever you're going to mount it to, put the other stud through the mount brackets, making sure to run a ground wire crossing over the rubber biscuit.
Or you can shop around and find the older style Bendix/Airtex rounded top soda can design pumps.
Or you can shop around and find the older style Bendix/Airtex rounded top soda can design pumps.
David_DuBois
Jedi Warrior
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Vince - They can be purchased from Pegasus Racing https://www.pegasusautoracing.com/advcat.asp?CategoryID=AIRFUEL
but they are probably cheaper from other sources if you can find one.
Cheers,
but they are probably cheaper from other sources if you can find one.
Cheers,
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The average engine, when putting out 50 hp, will require about 4 gallons of gasoline per hour. Other power levels will be proportional. Eg. 100 hp = 8 gallons per hour.
D
D
running the new Facet, Purolator, Napa, black, plactic molded pump in the battery box, passenger side. No noise, $32 a piece. Bought 2, mounted one and put onein the trunk. If it fails I can walk into any Napa and get one. Rated 1 to 3 or 4 psi. Use a ropund, chrome regulator. Whole package less than one Lucas. PS, moss sell it for 90 plus dollars.
David_DuBois
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dennisp said:
With a pump that puts out 1.5 - 4 psi (the normal range for the low pressure Facet pump), there is no need for a pressure regulator.
"Whole package less than one Lucas"
Since Lucas fuel pump are nonexistent (and have always been so - Lucas didn't make fuel pump), anything would be less. I think you are talking about a SU fuel pump.
Cheers,