Technical > Spud Miller's Cave

Help with stack injection

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Gold Digger:
Make sure the rotation of the pump is going the right way                   
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How can I identify the rotation of my fuel pump?

Position the pump so the inlet is on your right and you are looking at the cover plate end of the pump. If the small dowel pin in the cover is at the top 12 o'clock position, it is a front cam drive rotation. If the pin is at the bottom 6 o'clock position, it is a belt drive or rear cam drive rotation.

 

L79_Acadian:
Update, well today I had the motor running on Alcohol for about 30 seconds. I think it was running, because I had poured alcohol down the line from the barrel valve to the shut off. I took the pump off, checked the rotation, and its correct. Then I put a drill on the pump, spun the drill in reverse(engine mounted pump), and the pump put fuel out of the line as its supposed to ( I unhooked the line from the pump to the barrel valve). So that tells me the pump is working as its supposed to. I think part of the problem is the starter, its a gear reduction, and I don't think it spins fast enough. Tomorrow I'm going to check all the pill and bypass holders again, to make sure they are not leaking, or dirty. The tank is in the front of the car, lower than the engine, but with a dragster that's the only place for it.
  Thanks guys,
      Roger :-\

H.G. Wells:
If you had it running for 30seconds I doubt it is the starter.  I suspect you have an air leak in a line.
You may not ever see it leaking fuel either.  I have had this happen several times, especially at the first of the season after the lines have set.
Many times it was the fitting at the bottom of the pump not allowing it to draw fuel because of a small crack or just the line itself developing a leak.

Right or wrong, I start mine on Berryman just about every time.  Too many episodes worrying about a primer bottle and I always have Berryman around.
You can keep up a spray till it pulls fuel, but be very careful of backfires.

AF150:
Make sure that the idle bypass coming out of the barrel valve is either blocked off or that there
is a check valve (poppet valve) on the return line that requires about 30 - 40 psi to open it. Drag
racing on alcohol, you can plug it. High-speed will act as a pump saver.

hotrod316:
did you leak down the barrow valve?

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