Bad Walbro Pump?

Sean Krupa

Sean Krupa

Moderator
Past couple weeks, I've had an interminttent problem with Starting the Ty. I usually always let the Fuel pump prime before I crank over the engine. When I start it, it starts and studders real bad, like it's Camming. This only happens sometimes, usually when the truck sits over night.

I checked the Fuel pressure with the truck running and when I shut it off, and fuel pressurizes instintely and holds pressure off. I can still hear the Pump prime when I turn the key. It took all week just to get this Video cause the problem happened today and I drove it all week. (The idle smoothed out a second after the video)

Maybe it's a Bad tank of Gas? I changed the Fuel filter 2 years ago, not many miles ago. The Walbro pump was installed in 2000 with about 50k miles. I know have 99k miles. Maybe it's getting weak now....

The Ty still supplies a ton of fuel for Boost and in the 10s-11s for AFRs under boost.



Thanks,
 
Sean Krupa

Sean Krupa

Moderator
Re: Bad Walbro Pump?

PS.. The Check engine light is only half way on.. cause of the LED instrument cluster bulbs. It's not a real CEL.

I was also thinking about trying another 60lb Bin, to see if the Startup issue goes away. I'm also filling up with different Gas tomorrow from Shell. I usually get gas from Sams club.

Sean
 
Sean Krupa

Sean Krupa

Moderator
Re: Bad Walbro Pump?

It's a possibility. It's got new Plugs/wires from the Winter. Relatively new Cap/rotor. The ignition module and Coil were replaced in 2002 with 61k miles. Not sure if it's time for a new Coil?

Thanks,
 
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