To answer your questions: Yes on hard line from elec pump to Engine, but it is interrupted along the way by a Fram Hp2 fuel filter and finishes up at the engine with AN8 braided SS line for flex, and btw, I have a screen type filter upstream of the elec. pump. ,The pump is mounted near the rear underneath the level of the tank. The pump runs continuously, having an internal byp*** that opens when rated pressure is reached. The pump is rotary, with multiple vanes of fiber sheet. These Carter pumps have a reputation of good dependability, but if the use of your ig involves lots of trips a long distance from home, I would carry a spare, as very few parts places have the "on the shelf". I do, BTW run a safety switch triggered to open the circuit on no oil pressure, but with a switch for override.
Two things should clear all this up. (1) install a check valve between the pump and the fuel block, (2) use a manual choke when starting. Don't ask why, just try it.
One thing I did when installing the new carb was choose the manual choke series. I did not want the electrical hook up required for the auto choke because of the no access engine compartment. Because I live deep south and weather is never too bad I have not installed a manual choke rod to activate the choke at start up, I really need to add that along with the check valve. Thanks a lot for the advice.
Hmm, I must be lucky. Edelbrock 600 vac, GM mechanical pump, 327 300 hp cam, sits for long periods. Plain old ethanol gas with stabil. 2 pumps to the pedal and it fires right up, bought a choke kit but never installed it, never needed it. Dont recall if theres a check valve or not.
Well a non working choke is about half of your problem. Fought that same nonsense for years until I wised up. Still I have never seen an engine mounted mechanical fuel pump that was not a diaphragm pump. That is how they work. The arm moves the diaphragm and the inlet and outlet check valves control/work the fuel flow. If you can show me a photo of a mechanical externally mounted fuel pump I'd sure appreciate seeing it. I think the BS artists may have got you there. I'd agree though that with an electric inline primer pump with that engine you may have a flow restriction with the pump. I've got a small inline pump on my 71 GMC that had a 350 that worked fine for priming the pump and got me home by byp***ing the mechanical pump one night when it ****ped out but that engine wasn't stout enough to worry about fuel restrictions. The 500 Cad in there now might be an issue though.
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