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fuel pump question
Posted by Adam Dawson [Email] (more from Adam Dawson) on Wed, 6 Mar 2002 13:05:21
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My 85 900 is acting like the fuel supply pump is going bad. The problem is I can't get recreate the problem by running the pump with the engine off as discribed in the bentley manual. I get the hesitate and chug when in heavy accleration. I disconected the turbo silinoid power - to keep the boost low to see if the problem persisted. At first it did not but about 2 min later it started to hesitate. My supply pump will humm like a charm if you connect jump the wireing in the fuzebox with the engine off. I get the same humm that the main pump puts out just at lower volume - sounds healthy- . I am ready to order a supply pump but want some feedback as to why my pump functions fine yet sputters in heavy acceleraton. My brothers 87 900 did a similar thing when driving but his test yielded nothing when testing the supply pump (dead).
Could this be the beginning of the pump quiting? could the pump be pumping just not at the volume nessary so when there is high demand on fuel it will chug and sputter?
Thanks
Adam
85 900 turbo
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