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Old 01-22-2022, 09:02 PM   #1
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Default Best replacement fuel pump option

Got a CEL for running lean.

It's probably time for a fuel pump replacement, I don't know when the current one has been replaced last but, its probably a safe assumption that it has been a while.

Anyways, there is a plethora of options out there for fuel pumps, I know most of them are just universal, BUT I'd like to get a reliable one with the easiest, closest to OEM install there can be.

Any suggestions?
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Old 01-22-2022, 09:12 PM   #2
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I'd be hesitant to condemn the fuel pump in this case. These systems are old enough that the fuel pump is either on or off, there's no duty cycle for it or anything like that. The pressure is actually controlled by the fuel pressure regulator on the fuel rail. If you have access to one, I'd use a scan tool that can monitor your fuel trims. If you are running lean your fuel trims will be noticeably high (0 is the magic number you're after).

It's easy enough to test the regulator, with no vacuum applied the valve inside the regulator should be closed you should have ~45 PSI. With a vacuum applied to it you should have somewhere in the neighborhood of ~35PSI. If your fuel pump turns on normally and the numbers check out good the fuel pump probably isn't the problem. I'd probably start by checking for vacuum leaks.
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Old 01-23-2022, 04:48 AM   #3
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Well this might sound kind of stupid but the truck never has had an intake hose. as long as I've known and its been a couple of years and plenty of road time.
Do you think that it would take that long to throw a code? Or do you think it could be my actually airbox or MAF?
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Old 01-23-2022, 05:10 AM   #4
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I think it probably would have thrown a code a lot earlier but it never hurts to check. The MAF is still downstream from the air filter, so it should still be fine. If you do need to clean it use mass airflow sensor cleaner instead of brake or carb cleaner. It will also run a little funny if the air filter housing is not seated all the way down on the throttle body.
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Old 01-27-2022, 05:07 PM   #5
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Old 01-27-2022, 05:19 PM   #6
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Quote:
Originally Posted by Honeyhardbody View Post
Got a CEL for running lean.

<snip>

Any suggestions?
Fuel filter... clogged injector... so much more in the fuel system than just the pump.

What (specifically) was the error code? I suspect you have an OBDII reader?



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What he is saying is the aerodynamics of a D21 is a brick in the wind.
Probably at least as bad as a Jeep so worse than a cow.
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Old 02-18-2022, 10:55 PM   #7
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It actually might have just been the way the airbox was seated. I noticed one of the washers I had under the wingnut was freely spinning, added more washers, no more codes! Woooooooo
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