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BEHIND THE ASHTRAY IN THE FUSEBOX, A WHITE RELAY STANDING STRAIGHT UP.
Bulb warning failure relay, a big round and red relay, back the ashtray
The recommended spark plug gap for a 1987 Volvo (all models) is .028"
Volvo 240s have a white fuel pump relay, part number 3523608, about 2.5" long, 2" wide, and 1" thick. They used the same relay from 1985 until the end of the run in 1993. It's the same relay as the 740 & 940 most years also. It has a date stamped on it & it should be replaced if the date is more than approximately 10 years ago even if it's still working.
long answer: yes
sounds like you should try and replace the relay and see if works after that. could be a switch.
location of fuel relay on 1987 acura integra
Motorweek - 1987 Volvo C30 27-8 was released on: USA: 26 October 2007
Motorweek - 1987 Volvo XC60 28-34 was released on: USA: 24 April 2009
Motorweek - 1987 Volvo XC60 28-37 was released on: USA: 15 May 2009
Motorweek - 1987 Volvo S60 30-7 was released on: USA: 22 October 2010
Motorweek - 1987 Volvo C70 25-33 was released on: USA: 21 April 2006