I have a very baffling issue with my 1992 Volvo 940 GL (234). The mileage is 168658. I’ll try to make this as concise as possible. My wife made a left turn. When she switched from brake to gas, the car died. Previously, no problems existed with the 940. I tested the car by shooting ether into the throttle body. The car started, then quickly died. I deduced that this was a fuel problem. The 940 has a new fuel pump (Rex/Regina, single pump in tank) and new fuel filter. The system was tested with a new fuel pressure regulator and a new fuel pump relay. No change occurred. It also has a new oil pressure switch. No change occurred. I have checked all fuel lines by using compressed air. No blockage exists. No pressure exists in the fuel lines. Fuel lines were tested along the fuel rail. Pressure read 0 psi. When in ON position, all electrical aspects of car appear activated. The alternator tested well and the battery is new. I have exhausted all troubleshooting procedures from Volvo technicians and some of the online community. Now, the 20,000 dollar question: What in the Hades is wrong with my car? All help is wanted and appreciated. Thank you in advance.

Did you solve your problem?
I have a very similar one and it's driving me crazy!

If I understand your post, your fuel pump is not activating?

If the relay is new from *after* the problem then it's *probably* not the issue. But you can ocassionaly get a bad replacment relay. It does happen, not often but it is a possibility. Be sure the new pump relay works and eliminate it as a potential problem. I think the FAQ decribes how to test it. You could also test your old one and see if it was ever a problem.

The RSR is the most likely culprit imho. They fail suddenly or intermittently cause a lot of trouble for people trying to diagnose the fault. Testing it is very easy. Just flip the fan RSR (you have two identical ones) and see if there is a change. Conclusively eliminate the obvious, then move into the less-obvious. The RSR has already been mentioned but let us know that you tried it.

If the pump does not activate at KP2 then I'd suspect an electrical fault. Since it happened on a turn, I'd further suspect that something shorted out or came loose. I never figured out why my own regina car died on a turn at sonic. It never happened again and I never diagnosed it. I chalk it up to haunted car syndrome, but I say that only in jest, as some people will get upset if you trash-talk an entire car. However, when a motor mount broke on my 145, a hard break caused the engine to lurch and a wire to my coil(not a spark plug wire) pulled loose killing the car. I was able to figure it out easily, but there is a lot more open space under the hood of a 1972 145. Double check every electrical connector. It could be something no readily visible.

You can also check wire continuity at the pump/sending until wiring plug in the rear. Incidently, your fuel gauge does work when you turn on the car, correct?

An obvious question, but did you check the fuel pump relay?

Unrelated to the relay, my 1990 740 Rex-Regina inexplicably died one day pulling around at a Sonic. I rolled it to a parking lot and the ignition did not work. No crank. No nothing. It was very weird. After 15 minutes, I called a tow truck but then I decided to try it one last time it fired right up. Never happened again, never figured it out. I got rid of the car and went back to the Bosch injection system in my 95 940. I think Regina Systems are cursed/haunted. Nothing but trouble for me.

"I think Regina Systems are cursed/haunted. Nothing but trouble for me."

IMO, this is how myths get started. Bad-mouthing the whole system based on one example.

I'll take the other side and say I've found the Regina FI to be as good as they come. I only have 2 years on it, but it starts instantly at -30°F, has a smooth idle, and just delivered 28.3 mpg over 223 miles at an average speed of 58.2 mph. What's not to like?
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

I'll reiterate. nothing but trouble for *me* I had many unpleasant expereinces with my regina 740 which I won't detail here.

Some of you swear the ZF tranny on the 740 GLE is junk, mine was perfect. These things vary person to person. My experiences with regina were as a whole unpleasant, hence my bad 1st impression.

My point is that a blanket statements about a car type (based on a single example) are of little value in a forum like this one. In my opinion they can lead newcomers into believing them to be gospel and spreading the word: "I read it on the Brickboard -- Regina's are cursed/haunted".

What could be of value here would be some details on the "unpleasant experiences" you had with your Regina car, and how they were diagnosed and fixed. That would be fact-based information that might help someone, and more in keeping with the problem-solving goals of this forum.

BTW, your question about the Pump Relay was addressed in Heuman's opening post, where he said, "The system was tested with a new fuel pressure regulator and a new fuel pump relay." His problem is proving to be a real tough one. I wish I could be more help.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

A couple more for you to check. When the key is turned to K II position on the Regina system, you should hear the pump turn on. If not, could be a bad ignition switch, or the radio suppression relay in the engine compartment. If I remember correctly, the Regina/Bendix will not run the pump at all with a bad RS relay or connections.

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Gary Gilliam Sumerduck VA, '94 940 na Regina 150k, '86 240 180k

Gary,

The RSR relay is a good call (wish I'd said it). But it won't affect the pump, according to my '93 Regina diagram. It can, however kill power to the injectors, as we know.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

Bruce,
I don't know how or why, but it kills power to the fuel pump on my car.????
I had the same problem with no fuel pressure a while back ,and it turned out to be corroded connections at the RSR. My son just returned home with the 94 940, so I went out and checked to confirm, as bad as my memory has been lately. It's all just a blur. If the RSR is pulled, and out of the circuit, there is no fuel pump action . It's a beefy relay, with 40A markings on it, so I assume it is set up for a high amount of current. Maybe they ( Volvo) made a wiring change late in 93, and it carried over to 94? Either that or I am confused ( nothing new)as to correct name for the relay. It ( RSR?) is clipped on the fender well in the engine compartment, right beside the ABS box. With the fuel pump relay ( small and blue) behind the ashtray with the rest of the relays.
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Gary Gilliam Sumerduck VA, '94 940 na Regina 150k, '86 240 180k

Hi Gary,

I forgot my plan to test my RSR/Pump relationship till a few minutes ago. But it's (finally) a mild evening here so I went out and unplugged the RSR, turned the key, and got the normal 1-second run on the pump, just as the diagram led me to expect.

Guess that doesn't prove anything about Heuman's '92 or your '94 though, only that I read the diagram right.

I even pulled the cover off my FI relay to watch the 2 armatures. (One of my Anal Engineering mods was to make up a 16" umbilical, so my FI relay lives in the glovebox, where I can better hear the reassuring clicks.) All was normal -- Main relay picks and holds, Fuel relay picks then drops after a second, and I could hear the pump while it was energized.

Wish I has more to offer on this toughie.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

Hello Bruce; Yes, I looked at the wiring schematic, and did not see any connection either. Which does not give me a very warm feeling. That either means there is something amiss, someone has been mucking around somewhere with the wiring,or it came from the factory with a different setup that does not match the factory wiring diagrams.
If I can get #1 son out of the car for more than 20 minutes, then I guess it is trace and diagram circuit time to find out what the hey is going on.
As per the other part of this thread, my Regina equipped 940 has been one of the more reliable vehicles I have ever owned. And that includes a fair number of the exalted Toyota and Honda models, and four other Volvo's. Only one fuel pump to deal with, and no AMM. Mine even has the distributor at the front of the motor for easy access, like the 240.
Since the gentleman has not posted back on this problem, I assume he is still wrestling with it. The only other items I could think of were checking of the FI system and fuel pump grounds. Sometimes it is the simple stuff, and folks miss or forget. Or the ECU.
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Gary Gilliam Sumerduck VA, '94 940 na Regina 150k, '86 240 180k

I'll try pulling the RSR on my '93 tomorrow and see if it kills the "Key On Prime", but I can't see anything in the diagrams.

They do show the RSR controlling the EZK coil primary on the LH turbo, and the injectors on the LH N/A, as with Regina. No connection to the Rex that I can see.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.

The easiest diagnosis that ever cost me $600.00

You didn't mention the RPM Sender (aka Crank Position Sensor).

I know you said it stated on ether, but if your RPM Sender is the original one, it's a prime suspect. Without it, the ignition is dead, which in turn prevents any fuel operation (a safety feature). It's less than $30 at FCP Groton.

Probably more info in the FAQ feature.
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Bruce Young
'93 940-NA (current) — 240s (one V8) — 140s — 122s — since '63.