KSE Tandem X pump

[shadowj38]

Has anyone had to run a smaller pill than what KSE recommends to get your pressure between the 6-9 psi? I believe they recommend a .220 pill. Mine has a .200 pill and has 4psi at 3500 rpm. Kse said it should be around 6psi at 3500. Just wondering if something's wrong with my pump or if I just need a smaller pill. This is on race gas.

[RCJ]

Mine has a .200 and I am at 4psi, which is what I want.I would run what ever gave me the pressure I wanted and not worry about it.

[shadowj38]

Is yours at 4 psi at idle or at 3500 rpm?

[stock car driver]

remove the pill etc and run a external regulator.

[fastford]

remove the pill etc and run a external regulator.

the pill is on the return side, where are you putting the regulator ?

[MLR19]

The regulator goes in the return line, take the pill , poppet & spring out of the pump. Have ran them this way for years.

[MLR19]

Must use a bypass style regulator.

[shadowj38]

Thanks. I believe that's the route we are going to go.

[fastford]

Must use a bypass style regulator.

ok, thats what i was thinking , ive never had a problem with the pills , Do you use the same regulator for alcohol as with gas ?

[RCJ]

Mine is at 0 at idle and 4lbs at wot.When we were on the dyno I jet the carb at 4lbs.Lower pressure is better as long as you don't lean it out.

[MLR19]

ok, thats what i was thinking , ive never had a problem with the pills , Do you use the same regulator for alcohol as with gas ?

Yes same regulator.

[shadowj38]

Ok here's my scenario. Pump has worked fine for me all year. 2 pound at idle and roughly 7 as best as I can see on the track. Last week I was warming the car up before my heat and it idled for roughly 10 minutes and shut off. I fired it back up and noticed I had 0-1 pound of pressure at idle. Brought it home, got it fired up and it was at 0-1 pound at idle and about 4psi at 3500 rpm. So I decided to eliminate the pill spring and poppet and plumb in a regulator. At 3500 rpm it will now come up to 9psi but it fluctuates. It won't stay consistent. Let it come back to an idle (1600 rpm) and it goes back to 0 and will eventually shut off. Is it likely that my pump needs rebuilt? I bought it used and I don't know what it's life was before I got it.

[Lizardracing]

I'd check the gauges for accuracy 1st.
Then the fuel filter.
Then all the lines for damage or wear.
Then the pump for volume.

[shadowj38]

Pick up line on top of the fuel cell was not tight. Was sucking air.

[lazermod3]

pick up line on top of the fuel cell was not tight. Was sucking air.

imagine that!

[shadowj38]

A perfect example of why you don't overlook the simple stuff.

[fastford]

dont feel alone, this problem has bitten a lot of people including me.....

[MLR19]

We had another freak thing with a KSE pump last week. The set screws that hold the pulley on the pump backed out, & the key worked its way out. The pulley was slipping on the shaft & only driving the pump under a light load, had 7 psi idling & zero at the end of the straightaway . Unfortunately by the time we found the problem it cost us at least 1 piston. Another thing to add to the checklist when bolt checking.

[shadowj38]

It's amazing the things that work loose on a race car!