Aftermarket electric fuel pump

[obxtrainman]

I have an aftermarket electric fuel pump mounted in the engine compartment. I know this isn't ideal. This pump is rated at 5-9 pounds of pressure. I am aware that my dual SU setup should be using around 3 pounds of pressure.

My question is. What, if any, symptoms would the over pressure pump cause?

Thanx in advance to any responses.

OBX

[beandip]

The excess pressure will over come the shut off valves on the floats of the carbs . the fuel level then will be too high and the engine will run rich with raw fuel running into the engine . the fuel will also spill out of the over flows and either run into the air cleaner box or onto a hot exhaust manifold. You can buy a pressure reducer to control the excess pressure. Running the excess pressure is a dangerous thing to do. Gary

[obxtrainman]

Thanx for the reply Beandip. I'm not questioning your knowledge. However, I am wondering if the pump pulling the fuel so far, instead of pushing it, won't cut the pressure down somewhat. Any thoughts?

With what you did say. It would explain why when I used the colortune, I had to have the mixture nuts almost shut off to see any blue. I never did get a true solid blue color while trying to use the colortune.

I had called Steve from Ztherapy, he told me the first thing to do was drain the oil in the dampers, and use ATF. I still haven't called him back yet. The weather has been terrible here for awhile. It seems the only nice weather has been during the work week.

I still haven't ruled out the points at this point either. Since I put in the BD reman distributor, I 've noticed that I have to set the points at .017 just to get 36 degrees of dwell. Not to mention, it seems I'm not truly getting the heel of the point to stop on the highest point of the cam. I wish I knew how to make a remote to turn the engine over, it would make it much easier. I have an idea of how, but not sure.

In the end, I'm sure I will find it has been something stupid, or a combination of stupid things causing me to not achieve proper tuning (ZBliss)

OBX

[sblake01]

Have you run a test to determine the actual fuel pressure? If you install a pressure regulator set to the proper setting you can at least then rule out fuel pressure as the cause of the problems you're experiencing. That might even solve them. I know from experience on the EFI cars the incorrect fuel pressure, high or low, will cause problems that mimic other non fuel related problems.

[obxtrainman]

No I haven't tested the pressure. I was just looking at pumps on JC Whitney site. They have a couple that will get me down to the right range. One was for 1.5 thru 3.5, and one at 2.5 thru 4.5. Two different types, one for $45.00, and one for $103.00. The only fuel pressure regs they showed were rated 20 lbs- maximum, any way expensive.

Where the car is now, It's sounds great in the driveway, and on the street here. But when I get out on the road, and up to cruising speed, there is a slight bump, hesitation. I don't know what to call it. I can feel the car just kind of jerk a little every so often. It changes how hard and often with different adjustments on the carbs.

I'd take it to a real mechanic if there was one down here on the beach. One I asked said he would have to borrow a synch tool:stupid: Another told me I sounded like I had more info than he did. ECT, ECT, ECT. None of them are familiar with the dual carbs. After my guy messed with it, it wouldn't even idle after I got home, I had to start all over:stupid:

I will not give up

[sblake01]

When I put the Weber 40DCOE and electric fuel pump on my L320 pickup, it needed a pressure regulator. I bought this one. Adjustable from 1-4 psi, inexpensive, and has worked fine with no problems for the last 10 years.

http://tinyurl.com/2uwdsa

[Z train]

Don't forget the return line!!!!

[sblake01]

I "T'd" that into my gas tank vent hose. Obviously you'd have to come up with something else on a Z. Ah, the simplicity of a 1964 vehicle.