'98 ranger running lean no vac leaks MAF or Fuel pump?

[Bajabronco]

Yeah, I was afraid of that, the freeway is fine but the in town hurts a little.

 

[96Greenster]

So what do u think was ur problem? the FP or the MAF?

 

[Bajabronco]

Fuel pump solved the hard starting but not the mileage or the CEL, MAF made the mileage better and I haven't gotten a check engine light yet.

 

[Bobby]

Testing fuel pump

I know one way to check if your fuel pump is working properly or not. I know u switched it out already but u might be able to use it as future reference. One way is with key on, engine running check the psi, then restrict the return line, and the pressure should just about double, but only do this for a couple seconds or you can damage the rubber diaphragm in your regulator. One way to check if the diaphgram is ruptured is to check your dip stick for a gassy smell caused by gas leaking into the crankcase. Another way to see if gas is in your oil is to check its flammability compared to clean oil. Now for failing the emission test, it might of just been from your custom exhaust, a CAT can make quite a difference, but who wants one of those?

 

[Alwaysoffroad]

when my MAF went out due to fluids shorting that circuit(sp) i lost massive amounts of power...the truck wouldnt go faster than 5mph.. i replaced it and it worked fine but i think your issue is either fuel pump or filter