Engine goes off after 7.1 kilometers, fuse for injection burns!

Hello dear Volvo fan community, have the following problem with the Volvo of a friend: V70 2.5 144 PS EZ 12/97 approx. 413000 (!) Km, the engine stopped a while ago the engine just went off in a curve and does not jump any more. I looked through it once, in the “small” fuse box in the engine room (not the one in the water box) a 10A fuse burned through,Bennenung Injection, new fuse pure but sofrt only with ignition one burns again. After that one week later the fuel pump jammed off and see there, fuse remains in it, so fuel pump renewed. It then came then 7 km far to home there was again the same problem. Then I broke in the fuse box in the water box the fuel pump relay and after exactly 7 km again the same ind a curve goes out and fuse again through it. I then found out that the Fzg. longer stands there (about 14 days) the fault is gone until you drive again. I then have taken a closer look at what is more closely connected to each other, and the battery mass is not always re-used, but again.