Get something solid like a wood stick or rubber mallet and hit the fuel pump and/or filter a couple of times.(in rear close to exhaust tail section.)

If it starts up, you know what in need of replacing.

__________________
1979 300D 220 K miles
1995 C280 109 K miles
1992 Cadillac Eldorado Touring Coupe 57K miles SOLD
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1979 240D 140Kmiles (bought for parents) *SOLD.
SAN FRANCISCO/(*San Diego)
1989 300SE 148 K miles *SOLD