Hello all I'm new to Comanche's and have my ole girl stuck in southern Louisiana with a storm possibly coming. I have a 62 PA24-250 with the O-540-A1D5 my engine driven fuel pump is barely putting out any fuel pressure engine runs rough and almost no pressure on the fuel pressure gauge. When I turn on the electric pumps pressure is good and engine is smooth. I don't have access to my A&P right now and no A&P on the field as the airport its at is unattended. I have come across 3 pump numbers

41271 - looks like an old number
40295 -
LW15472 -

Which do I need to order? as these all have quite a difference in price. The LW15472 seems cheaper but read something about some newer pumps have to have a expensive modification done anyone with any knowledge on this.
Thank you in advance for your help
n24aa@yahoo.com

This one: LW15472

Thank you Kristin Ordering now. How did I luck out that's the cheapest I usually end up with the highest priced everything LOL.

That engine driven fuel pump is identical to a old chevy fuel pump. Common as dirt and not expensive. The automotive version would cost you 30 bucks, but it has cheaper valves in it I think. Some things about Lycomings are really nice. I think you can only really go wrong if you tried to put a higher pressure fuel injected pump on a carbureted engine.