The 740 and 240 have nearly identical drivetrains.
Locations of some items could be different - however I expect that you
have the same two fuel pumps as the 240.

To quote from "1986 240 DL - Won't start"
(posted today, 7:49 a.m.)

If engine turns over but does not catch, then you must have a fuel or
spark problem.
Easily fixed versions of these:
1) Bad ingition system fuse (0r bad contact in the fuse/holder).  It's a
white plastic holder, about 1 foot rear of the battery, on the fender
wall (on the 240).  Handle with care as it has two positive wire leads;
either will ground to anything if they come loose.
2) Fuel pump relay kicked loose from its wire plug-in.  In the 240, it
islocated in front of front passenter's right foot, on the firewall.  An
angry passenger kicked mine loose a couple times.  Or the relay could be
dead.
Other trouble sources: bad computer, bad in-tank or out-of-tank fuel
pump (you have one of each).  All these are jobs for a knowledgable shop
and will cost some good money.

Bruce Pick
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Try the ignition amplifier, behind the battery on the inner wheel arch. Not
guaranteeing it but we had a similar problem and this was the fix.

Regards, Roy