Good Afternoon:

I have a 1998 DI that was purchased two months ago. I have noticed that when the engine is hot and the outside temp is above 85-90 degrees, it seems hard to start and has to "clear out" after it does. I replaced the Fuel Temp Sensor...still havn't determined whether this helped,or not.

Today, the vehicle had been sitting for about 1.5 days and I had to attempt to start it several times...which it finally did?

I do not have any codes, and the vehicle seems like I'm driving into a very strong headwind when pulling hills, or with a small load of about 1500 pounds, or so?

I have not checked fuel pressure...any thoughts?

Coil pack (plugs are new Bosch Platinums and new wires)
Fuel Pressure Regulator
Fuel Pump

Any guesses?

Thanks!

 

I would probably start with the fuel system also. If not done, do the filter first, then check the pressure and see if it's good. with 80k miles, I wouldn't think the pump would go (got 150k out of mine), but ya never know...

 

Sorry...feel kinda bad...changed fuel filter in conjunction with the induction service and the 60K recommended service about 2-3 weeks ago...my bad!

 

Sounds like a bad fuel pump to me.
You need to check your fuel pressure.
Should be in the mid 30's at the fuel rail with the key on.

 

Thanks...where is the best place to get a fuel pump and fuel pressure regulator?

 

Do a search on here for fuel pump. I remember a post a while ago someone had a part number to replace just the pump without buying the whole assembly. It was a real eye-opener when I priced a whole replacement brand new one.

 

No need to buy a fuel pressure regulator.
Just check the fuel pressure and then give us the numbers.

I bought my fuel pump at AutoZone, and just a FYI, you DO have advanced evaporative loss.

 

And the numbers are.......

Cold - Key On (24 psi)
Cold - Running (30-31 psi)

Crack the throttle - fell to 28 psi

Outside Air Temperture - 85.1 F

KENO (41, 14, 23, 83, 61).....oh, sorry??? Got carried away...thanks!

 

Sounds like your fuel pump cannot supply the demand.
When the truck is idling the pressure gets built up, but once you increase the fuel demand the pump cannot supply enough.

The 24psi when cold, how long did it sit? Over night? A week?
After sitting for a week or more I would expect a lower number before starting the engine, but not from overnight.

 

Your funny, try 3*