Fuel Pressure Solved, Lacks Power Mid-range

[txasylum]

So, I figured out the fuel pressure problem. Fuel pressure was too high flooding the motor. I put a new fuel pump on the car, still pushing 4lbs. So I bought JEGS fuel pressure regulator and tuned it down to 2.5 lbs.

Keep in mind I just put an 34PIC3 and a new 034 distributor on the car.

Next problem. I have excellent low end power, but as I get to mid-range on up I lose power. Seems like not getting fuel??? IDK. I assume it is a jetting issue? IDK.

I'm assuming I need to drain the gas and try a larger main jet?


Thanks

[VW_Jimbo]

What are the engine details?
_________________
Jimbo

There is never enough time to do it right the first time, but all the time necessary the second time!

[txasylum]

Okay, problems still there.

Motor is a 1600cc motor. Just rebuilt, haven't had it running down the road until now. I put a new 034 dizzy on it, a used Empi 34Pict3 carb, new fuel pump with fuel pressure regulator to 2.5lbs.

Car runs and sounds great sitting in the garage, but when I drove down the road I had good low end power, but mid-upper range loss of power. The main jet is 127.5.

I just swapped out the main jet for another 127.5. Ran down the driveway, turned around, and coming back up the driveway it seems to lose low-end power too.

Suggestions?

[VW_Jimbo]

Remove the regulator. Try it without, as designed.

Stock 1600?
_________________
Jimbo

There is never enough time to do it right the first time, but all the time necessary the second time!

[Starbucket]

Check the accelerator pump setting. Look down carb (motor off) and slowly open the throttle, gas should shoot at first movement and keep going until WOT, if not adjust the cam on carb side.

[busdaddy]

[txasylum]

There was too much pressure flooding the carb. So that is why I put the regulator on it. I will try it without and see what happens.

[txasylum]

No, it was JEGS model similar to the HOLLEY model. Specifically it was here at this link. https://www.jegs.com/i/JEGS/555/15911/10002/-1

[busdaddy]

[VW_Jimbo]

[busdaddy]

[txasylum]

Pressure is 4lbs on the new fuel pump. Regulator brought down to 2.5lbs.

Idles and revs fine. Problem is it has no power when I drive the car. I'm going to throw on a 30PICT1 carb I have sitting around to see if I have the same problem.

[txasylum]

For those that are following this post, I think I found the problem. It was the carb itself. I put a 30PICT1 I had sitting around ran it quickly down the driveway. I didn't have time to run it more than that, but there was a noticeable difference. So I plan to take the 34PICT3 apart and clean it up. I'm guessing some dirt in the carb.

[Uberchin]

No. If your carb if flooding, it is usually a bad needle and seat, or you float is set wrong, or your float isn't floating. People sometimes put the little bow that holds the float in place into the carb incorrectly and it restricts movement of the float. It isn't your fuel pressure.

[johneliot]

“A used empi carburator”, that might be your problem.
_________________
John

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