benson64L Posted July 10, 2010 Report Share Posted July 10, 2010 Hey whats up i got a question about a electric fuel pump i just installed. Ive got a 79' 620 with the L20b engine, i just put a Holly Red pump on it and it seems to be flooding it out. The pump is only rated for 7 psi, is that too much? Is it possible to regulate it down lower? Quote Link to comment
]2eDeYe Posted July 10, 2010 Report Share Posted July 10, 2010 What carb is on it? Webers work best at 3-4 psi. Not sure what the Hitachi's optimum pressure is but it should be close to the weber. You can buy a regulator and pressure guage to fine tune your pressure. Did it run fine with the stock pump? Quote Link to comment
datzenmike Posted July 10, 2010 Report Share Posted July 10, 2010 Perhaps it had factory air, they had electric pumps. L fuel pressure is 3 to 3.9 PSI so I would say too high. Quote Link to comment
benson64L Posted July 10, 2010 Author Report Share Posted July 10, 2010 I pretty sure its the stock carb, and it was runnin fine with the mechanical pump but it went out on me the other day and i heard the mechanical pumps are not that good so i put this Holly electric pump on yesterday. Do ya know of a good place to get a pressure regulator? or should i get a pump that only pumps between 3 and 4 psi? Quote Link to comment
Braden Posted July 11, 2010 Report Share Posted July 11, 2010 regulator would be fine, mr gasket makes one that is adjustable from like 1-7 lbs, run about 25 bucks Quote Link to comment
datzenmike Posted July 11, 2010 Report Share Posted July 11, 2010 Nothing wrong with a stock mechanical pump. The after market ones are shit. And it pumps the correct pressure.Your profile is incomplete but if you are near the PNW there are lots of wrecking yards with L motors in them. Hell someone here will send you one for cheap. If I ever needed one all I have to do is cut the back yard. Quote Link to comment
banzai510(hainz) Posted July 11, 2010 Report Share Posted July 11, 2010 heard the mechanical pumps are not that good Who said that???????????? I think Maybe Hollys are junk you need to pressure down your system and hope it didnt ruin the needle valve on your carb the replacment mechanical pumps are not bad(stone or black stone was the brand)I have ran them before but dont look stock Later 620s had electric I believe But if you had a mechanical one on the head you still can get replacements Quote Link to comment
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