You know I never thought the electric fuel pump topic could get unearthed again, but this is a very good thread with some genuinely new information and hardware. Keep in mind that I haven't owned an IDI since just after Covid but I do have a fair amount of gasoline fuel system background.
i know it sounds crazy, but the answer to all this might be dual electric pumps. I know this seems overkill for a 400 cubic inch diesel engine that only seems to require 2-5psi of inlet pressure, but if you haven't been around the high horsepower drag race stuff for a while, i'll bring you up to speed: dual Walbro style pumps are quite common and can support upwards of 4-5 times what even the most stout IDI can put out with regards to horsepower.
Again, I know two pumps sounds crazy, but this is a complete assembly with two
ethanol compatible pump delivering 340 LPM/90 gallons per hour, a billet outlet coupler, a very nicely engineered stainless steel mount, fuel socks and harness/connectors for each pump. That's a lot of hardware for $249. You would have to deal with a pressure regulator and return, but I think there are some pretty good solutions within this thread to address those items.
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Purchase Dual Pump Assembly 2 x 340 LPH Pumps, E85 or shop other Dual Pump Systems (Complete) and Racetronix products.
www.racetronix.biz
By the way: if you think a single Walbro style might be good enough for your application, have at it. Racetronix makes a single inline style pump
with a regulator designed for 7 psi carbureted applications. For $80, somebody with an IDI ought to try one as this really could solve a lot of problems at a very reasonable price point.
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Lastly, the supply chain and quality issues with electric fuel pumps are real and really did trash some products that seemed to work pretty well before they got "cost/quality reduced". I think it's worth pointing out that Racetronix shows the pumps on their website as genuine Walbro and Made in the USA (see above pic detail). I think this is pretty important regarding quality, availability and at what I think is a pretty competitive price.
Lastly, I don't work for or have any affiliation with Racetronix. I am familiar with their stuff as it's super popular with the drag race crowd and although I haven't made a pass in a drag car in more than a decade, I'm still around it as often as time allows. This was all done with a quick google search and the Racetronix stuff was at the top of most search lists.
That's my .02 worth. Unfortunately I only have a PSD in my driveway, so all of this will need somebody else to trial.
Again, this is a really good thread and it makes me happy that this group is still trying to find a good solution to the IDI fuel pump problems that continue to persist.
