Remove the air cleaner housing. Then look directly below it. The fuel distributor will have 6 metal fuel lines coming off it and going up to the head just above the intake manifold at each cylinder. The EHA is a black plastic part bolted to the right side of the distributor, if my memory is right.

Look for leaks at all connections to the distributor but don't try taking the distributor apart . It hasn't yet happened to me but I've read on this forum of the o-ring between the EHA and the distributor failing and leaking gas.

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1986 300E
1993 Volvo 940 Wagon
1984 Volvo 240 (daughter's)
1976 Dodge 1/2T pickup, gas hog