yes...that is possible

I finally found the relay, and am disappointed that I have the MAS integrated $300 relay. lol.....

I was reading about jumping the two pins together to get the fuel pumps to work, is it still pins 7 and 8 on the MAS version of the pump relay?

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You do not say what year the car, how many miles, or what you know of it's past repair/maintainance history since this is a "new" car for you.

Log in and using the search option up in the header, search overload protection relay or OVP or overload protection relay. See if any of those threads relate to your issue.

If you do not know for sure that the OVP relay has been replaced and is not the original one, I rec you spend $80 for one. Not just check the fuse(s) in it, but buy a new one. As that thing fails, all kinds of intermitant electrical issues arise. When it dies, your car does not run at all.

Did you check for error codes??

After that, then test MAS relay.

It's a 1990 with 117k on it. Hmm, I thought just the MAS controlled the fuel pumps.

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fuel pump is mas controlled you are gonna have to do this

test current draw of the fuel pumps
swap in a known good mas and air conditioning relay(corrison)

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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)

JCD, Not sure how the MAS is put together, but the earlier fuel pump relays do develop bad solder joints internally that can act up as the relay warms up with the motor running. That may also be happening inside the MAS. Also, the earlier relays would shut off if engine speed (TDC) signal were interrupted for 1 second. Consider that possibility, too, that the TDC sender unit at the front of the block is getting hinky.

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1988 California version 260E (W124)
Anthracite Grey/Palomino
Owned since new and still going strong and smooth
MBCA member

Past Mercedes-Benz:
1986 190E Baby Benz
1967 230 Inherited from mom when she downsized
1959 220S Introduced me to the joys of keepin' 'em goin'

There are only 10 kinds of people in the world--those who understand binary and those who don't