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In post #1 you mentioned the engine was freshly rebuilt.
If the fuel pump rod wasn’t replaced at that time, you might consider installing a new one.
It’s another part you don’t want to purchase at you neighborhood parts store and do some research to insure the rod material or material on the top portion is compatible with your camshaft material.
The Edelbrock pump I installed is different, but it also has the ability to clock the two ports.
It is a nice feature especially if you plan building your own hardline up to the carb.
Now would also be a good time to install a good inline fuel filter, if you don’t already have one.
Redhorse Performance offers some nice ones.
Their product quality is top notch and they are also available through Summit Racing.
Wow nice job on your setup. Got my pump mounted ok. Still need to hook up my fuel lines. I used the push rod that was already in it when I got the car. Hopefully it's the correct one. If not the damage is probably done being I've run it for 2K+ miles since last summer.
So ends up the fuel pump was not the issue. Runs fine sitting still. Zero issues starting hot or cold, revs up nice and quick. Stumbles under power, hot or cold. I wrapped the fuel line by the headers just in case of vapor lock. I have a small hill in front of the house, and it won't make it up it. Tripple checked the timing. 12 at idle and 32 all in around 2900 rpm. Moved it around some and made no difference on the stumble. Drained fuel tank and its as clean as it gets. Suspected the fuel is why i drained it. This all started after filling up with ethanol free fuel couple weeks ago. Also, i was headed up a mountain and this happened maybe another 1000' in elevation. Last summer i drove it up on the Blue Ridge parkway which is double the elevation where i live and normally drive it around with no issue here or higher elevations. It's a sealed system so ran without fuel cap, no difference. Installed a fuel pressure gauge on windshield. Sits around 5 psi all the time. As a side note at first i thought it was a failing fuel pump because it showed zero pressure, but I pulled the little bleed pin, and it showed pressure again. Replaced fuel pump anyway since I had it. Edelbrock street performer. Took the intake manifold off, why i don't know, but everything looked fine so new gaskets on it and carb gasket. It has a Holley 750 with mechanical secondaries and manual choke. Choke it wired open, no chance for it to move. Carb was purchased new last summer and maybe 1000 miles on it. Pulled it apart and went through it. Clean. Floats seem to be adjusted ok via watching the fuel level through the float bowl glass. The hard fuel line is original. I chased it down as much as possible while it was running and can't find any issues. Fuel tank and rubber lines are new last summer and still appear fine. I replaced the coil, wires, plugs, cap and rotor. All MSD. Even replaced the MSD box last summer just because the original MSD box was really old. I installed an aftermarket temperature gauge and sending unit just to make sure it's not running hot. 180-190 max. I installed a new aluminum radiator last summer. Can't get the original gauge with a sender to read correctly. I just rebuilt this engine maybe 400-500 miles ago. Not burning any oil or leaking. No smoke. What am i missing here? Any help would be greatly appreciated.
