180° bend fuel line
If anybody knows what I'm talking about when I say the fuel line, originally formed in a 180° bend but not available as an aftermarket part (except one pretty expensive kit on ebay), that goes from the petrol tank, forward then bend backwards to the fuel pump, then fuel filter, then bend back to go towards the front of the car... Often ends up kinked, just as it was on my car.
I noticed a bit or surging, uneven acceleration but only when I put my foot down. At first I was afraid this might be fuel injection-related however searching forums seemed to dispel this. And the air flow meter is good (even if that was worn, it wouldn't be in high rpm but most used rpm). When I saw the tight kink in the pipe I reckoned not enough fuel was coming through when I put the pedal down. Just a theory. We'll find out once I finish putting the car back together.
Anyway here's a simple solution, fitted whilst I was replacing the fuel pipes, pump and filter. These 90° bends (12mm) are easily available on the internet and in parts stores. Generally plastic but I wanted metal ones myself. I do realise there's a little tension, however the little bit of fuel pipe between the two bends could have been shorter, making it straighter again. Ad it's much better than a kink! As for the second bend where it comes from the filter and goes towards the front, unlike the first bend, there is plenty of room to simply have a longer section of hose and curve it around. The multiple jubilee clips aren't too crowded, and of course you only need to take it off the pump to bring the pipe downwards and easily take the rest of when changing the pipe.
1975 Giulia GT1300 Junior, 1981 GTV6, some modern German stuff, and a 1958 Messerschmitt KR201.