I have a non computer friend that is working on a "88' 300 CE and here is the problem. Car starts fine COLD but starts hard when WARM with the following antics, "sputters and bucks for sometimes, 5 minutes. He has changed fuel filter (nasty) and fuel check valve. There are two fuel pumps in series, could one be not working? and is there a way to check the fuel pressure regulator? And if anyone has any other ideas that would be great. Thanks much
Have a good evening

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"