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Fuel pump question 700

posted by  Vos on  Wed Jul 10 05:08 CST 2002
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last visit: Mon Dec 21 13:54 CST 2009
[RELATED]

I have a question for those of you who have played with different fuel pump combos: As part of a conversion project (Regina->Bosch, on a 1990 740) we have gone ahead and added the Bosch main pump and filter (in its location under car around the driver's seat location), and it was actually fairly easy since the car was prewired for the pump after all! The Regina just did not utilize a pump there... We have the Bosch-intank pump, but I have heard that the Regina in tank is about 10X stronger than the bosch in tank.

Here is the proposed question: Any thoughts on if we will have trouble if we run the Bosch main pump, in conjunction with the regina in-tank? I would think any over-supply would simply return to the tank, right? Any safety issues in having that amount of volume returning in that fasion? Any differences in the sender units?

Thanks!

PS: I posted this question as part of another post, but though I should probably break it out by itself just in case.
--
Two '98-S70s and One '90-745. My First Car: '74 244DL Gone But Remembered!








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    Fuel pump question 700

    posted by  someone claiming to be philip bradley on  Wed Jul 10 05:38 CST 2002 [RELATED]

    No problem. I use a Walbro 190 LPH in tank pump and a Bosch 140 LPH main pump. You use more power to run two strong pumps, and probably more fuel is pumped and thus more fuel is recirculated back to the tank (assuming more is not used due to performance modifications), but this should not cause any problems. The recirculation system and the regulator seem to be able to handle it all without backing up. I have a fuel pressure gauge, so I would know.

    Philip Bradley







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