On the fuel pump directly under the fuel inlet is a bolt. Is this bolt an access to some sort of screen or strainer that could possibly be clogged?
Thanks for your replies in advance.

The 617.95 service manual makes no mention of the big hex on the fuel pump.

But your engine might not be a 617.

NO, not unless you have a 1957, three cylinder, series 3.6, triple expansion, Atlas "Cadet", only nine were manifactured tho.

What car do you have? but the answer is probably still "no screen" There may be one in the tank however.

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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"

Sorry for not mentioning the type of engine.
The car is a 1982 240D.

Those little pumps attached to the IP seldom give any problem. I would check and clean the tank screen located above the supply line, passenger side of tank. If those hoses haven't been changed they may be "weeping" and should be changed anyway. There are two on the other side of the tank to check also. they can drip fuel on your axle boot if bad so take a look at that side too.

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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"