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Re: fuel pump question? 87 900 TC running bad sometimes
Posted by JohnB (more from JohnB) on Thu, 6 Oct 2005 14:51:48
In Reply to: fuel pump question? 87 900 TC running bad sometimes, Brian, Wed, 5 Oct 2005 18:51:42
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OK, the definitive test is fuel pressure, period. You'll need to drill and tap a hole in the banjo bolt at the front of the fuel rail (radiator side of motor). Tap for 1/8" pipe thread and install a Stewart electrical fuel pressure sender. Wire it to the matching Stewart gauge (reason I use Stewart is they're the only ones with a gauge/sender under $100 I could find. Paid about $80.) inside the car, you don't necessarily need to mount it permanently. Then drive the car and watch your fuel pressure. If you have pressure drops when the car acts up, then it's your fuel pump.
You can also check the current draw to the pump but generally you need to know the current draw of a new pump. I think new they draw about 4-7 amps so if yours is pulling 15 you'll probably need a new one. Use an inductive pickup (Fluke makes a nice one, also good for AC), you'll probably need someone to ride in back to check the amp draw.
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