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Hi Will,
So you have Custom twin fuel pumps in a Regina.
Where exactly does the new pump get it's 12v?
Do both pumps quit by pulling fuse 11?
How long did the car behave after this modification?
Some ideas:
Check all of the connections of both pumps? Are they Walmart or
Autozone crimp connectors, or worse? Pull on them see if they come apart.
Pull the main fuel (twin) relay and check for loose socket pins.
Use a 1/4 male blade connector crimped onto a piece of solid copper
to make sure they are not loose. The pins can be repaired or replaced.
Check the RSR connector see if the female bullet pins are dislodged, pushed back and making a flaky contact. Bullet connectors are messed up in my car
Get parts from www.davebarton.com.
You can measure fuse 11 with your voltmeter when it doesn't start.
The 12v is supplied by 87/2 of the main fuel relay.
Confirm you have 12V and you can probe the top of the ATC fuse with your meter,
See if you lose 12V to the pumps or not.
It's harder to measure fuel relay 87/1 that powers the ECU's and RSR
you can wire a 12v lamp to 87/1 to diagnose that set of points.
The lamp needs to be on to run the engine.
https://www.ebay.com/itm/223514074403 14V w pigtail leads 50 pieces
https://www.ebay.com/itm/263194224649 12V LED W PIGTAILS 20 pcs $7.55
Both of these could also replace goofy priced Volvo ashtray and shifter lights
You can get 100 pcs bare wire 2.5mm 14V grain of wheat for about $13
https://www.ebay.com/itm/352373542466? The Chinese merchant advertises
these lamps at 14v AND 12v. Take your chances with this guy.
These can be used in Volvo rocker switches, and illumination for transceivers,
radios, etc
You could just as easily wire two lights to the fuel relay to diagnose.
relay coil 1 +12V 87/1
relay coil 2 +12V 87/2
Then you could confirm operation of the main fuel relay's twin coils.
Maybe I should do that here to help understand my evil intermittent failure?
Likely the second pump was installed to solve some unresolved issue
and now you need to fix problem #1 and recheck his work too.
Good luck, Bill
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