I'm trying to identify which fuel injection system I have in my 1994 940 wagon (non turbo). I have read that Regina only uses one in tank fuel pump while Bosch mainly uses a 2 pump set up.
Mine has a fuel pump mounted under the car directly underneath the drivers seat which makes quite the noise when running so I am assuming it is the Bosch system but want to make sure.

Also just in front ( going to engine) of that pump there looks to be a device similar (but much smaller) to a pressure regulator found in a propane gas system. Is this actually a regulator?

I guess I really need to break down and get me a manual for this vehicle.

Thanks in advance

Tim

sounds like a Bosch system, the other thing is the fuel filter.

late 94 and most 95 Bosch non-turbo 940's used a single in-tank fuel pump (same pump as the Volvo 850 uses), so that alone isn't sufficient to distinguish them.

if its bosch LH injection there will be a Bosch 'hot wire' mass airflow meter (MAF aka AMM) in the air path between the throttle body and the air filter box. Regina uses a "MAP" which is a manifold air pressure sensor.

your fuel pressure regulator is on the forward side of the fuel distribution rail/pipe above the intake manifold, its connected directly to the output of said pipe, and has the fuel return line, and a vacuum line connected to it.

Excellent info once again. Thank you both. Is that regulator looking device really a fuel filter? I dont think I have ever seen one that small except on my lawn mover.

Tim

the volvo fuel filter is several inches in diameter and long. maybe someone put a lame aftermarket filter on there?!?

this picture of one with a pump next to it, the pump is the SMALL one, the big one is the filter.



(single pump systems, of course, just have the filter).

ah, maybe what you're seeing is a one-way valve someone added to help in starts?

Actually, the metal fitting on top of the pump IS a one way check valve, and all Bosch systems have it, the Reginas do not...

what about single pump bosch systems, such as the 94+ non-turbo 940, and 850's etc ?

Thank you for posting that picture. The device in question is located on that fuel line to the left of the pump. Exactly where the connection with the clamps are in your picture. I will try to post a picture but I do believe after reviewing your picture it is an addon of some sorts. I am assuming the system goes as follows....fuel from tank to filter to fuel pump to rail....if its pump first then filter then this device is on the filter to engine side.

So after crawling underneath the car for a closer inspection I was incorrect....this device is between the fuel tank and the pump/filter assembly here is a picture of it. Is this a stock volvo device and if so what does it do? Notice the lack of clamps...lol fixed now. sorry for picture size new to tinypic.com

that doesn't look like any stock part I've seen. I wonder if someone cut the hose to replace part of it, and used that as a splice/connector. the corrosion on that thing is scary, I'd want taht OUT of my pressurized fuel system ASAP.

Agreed so it seems this isnt needed and I would feel much better to just remove it. How much pressure does the in tank produce anyway?

This 940 still has its minor quirks to repair but damn I enjoy driving it more and more every day. It's putting up serious competition against my VW CC ;P

the in-tank pump from a 2-pump system doesn't produce hardly any pressure at all, it just boosts the fuel into the main pump, where the pressure is developed. the main pump would probably generate as high as 60PSI or something if the line was completely blocked, but the fuel pressure regulator releases any pressure above 42-44 PSI (relative to manifold vacuum) to flow back into the tank.

the car will typically run just fine with a broken in-tank pump as long as there's at least 1/3rd to 1/2 tank of gas. my turbo would stumble and loose power on full throttle windups when its tank pump was dead.

You my friend are an enclyopedia of volvo knowledge and I thank you your informative replies.

can I swap fom regina to bosch?
1992 940gl regina fuel sending unit is bad and which models I can put there? 1993 regina?

No you can't do a straight swap. Besides, '92 and '93 use different size tanks. Have to use a '90-92 Regina sender.

So, that will be my only option? Find the 90 92 regina.

I have several Bosch units available that can be rewired for regina.
i personally have A rare!!! Regina 2 pump system in mine.
Pump in tank and under car.
We have piles of main pumps and intanks available
L&D Volvo parts Atlanta
Goldenblock