I'm looking into purchasing an '85 760 Turbo, but the seller said they suspect the fuel pump for the car not starting. It turns over otherwise.

My parents have a 740 parts car that I'm sure I could scavenge off, if this works.

Has anyone done this before (successfully)?

 

It depends on the parts car. If the parts car is a Regina ignition car it only has one fuel pump, in tank. If the p/c is a Bosch ignition then the pumps are essentially the same. The only replacement pump available today is the n/a/ variety. The turbo fuel pump is a little higher volume, but unless you're making super boost, the n/a is fine.

 

How would I go about finding that out? There's been an '88 740 GLE in the family for about 10 years, but I'm not too sure on the specifics of the parts car.

The N/A pump would be fine to get the car running/on the road? (assuming it's the Bosch style, as you said)

 

If it's a Regina ignition, it will have an HEI coil on the driver's strut tower rather than a conventional cylindrical coil. Here's a Regina motor...

Yes, the n/a pump will work for the turbo. That's all you can buy today, anyway. You would need to be making 220-250 hp to the rear wheels before the stock pump would be insufficient.
Modern fuel systems like the Volvo provide way too much gasoline to the fuel rail in an effort to assure sufficient fuel under all circumstances. The fuel pressure regulator sets the pressure; any fuel unused by the motor simply returns to the gas tank until it gets slurped up again. There is no mystery to fuel pumps; they are no more complex than an aquarium pump. They all look similar...the difference is volume pumped (Liters/Per/Hour or Gallons/Per/Hour) and max pressure before the pump motor stalls (remember, it is the fpr that sets the ultimate pressure at the engine). There are 2 types of pump locations, basically. Inline (under car) and in tank. In a 2 pump system the tank pump is usually smallish and is merely a lift pump to get the fuel out of the tank. Then, the larger, more powerful pressure-wise inline tank cranks the pressure way up for the trip to the engine. In a 1 pump system, the fuel pump is generally in the tank and pulls double duty as a lift AND pressure pump. That's how the Regina cars are...one pump in-tank. Any number of in-line fuel pumps can be used on Volvo turbos...the ultimate IMHO, is the Bosch 044 pump. It takes a little modding but has super volume and pressure figures. A Walbro 255 lph model or even a 190 lph model would satisfy fueling requirements well past 300 whp. In a highly modded set up, there would be a 255lph lift pump in the tank and TWO fuel pumps under car. But...not for a DD grocery getter!!

 

Thanks! That helps.

 

Would old fuel keep the car from starting? Apparently it's been parked for 2 years.

 

Oh yeah...always good to pull a tank hose before you begin...stale gas is bad enough but I've seen one year old gas that was brown and very cloudy w/ rust/contaminant particles.

 

Thanks. I actually found a running 760T that I'm purchasing.

 

Sweet! That simplifies things!!

 

Definitely. It's an 86, 764T with 300k KM.