Skip the auto shop - Our mechanics make house calls

Q: Truck sputtering going uphill.

asked by on

My truck sputters when going uphill, and has died a few times because of a lack of fuel getting to the carburetor. It has a new mechanical fuel pump and fuel filter, custom fiberglass tanks under the fender on each side, and I have replaced both gas caps. The carburetor has also been replaced with a Holly 4-barrel. It seems like it could possibly be a vapor lock issue, but I am not really sure what is going on.

A: I would only be speculating on this problem...

I would only be speculating on this problem since you have altered the fuel tank system on the truck. I suspect that the fuel pump is getting starved of fuel and when you are going up a hill causes the pump to not be able to keep up with the amount of fuel needed to supply the carburetor with enough fuel. I would check the volume of fuel you are getting from the fuel pump and see if it meets the specifications of the pump. If it is too low then look at getting a high volume pump and even look at getting a low pressure electric pump to help keep fuel supplied to the mechanical pump. Put the electrical pump as close to the fuel tanks as possible. I would also recommend that you have a professional, certified mechanic take a look at it, such as one from YourMechanic.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: P0321. Internet says it could be my crankshaft sensor?

These items are not connected. You have a couple of fault codes that are tied to different malfunctions. The crankshaft position sensor may cause stalling or a rough idle. A stuck on torque converter clutch may cause stalling when the...

Q: after takeing off the fuel cap and putiing fuel after replacing the cap the car take 2or3 time to start turns over good but

The problem is a leaking purge control valve is not sealing fumes passing it from when the valve is off. This will allow excess fumes that builds up in the fuel tank from refueling. These fumes get into the intake...

Q: Manual transmission clutch grinds and won't go into gear

It sounds like what is happening here is that the throw out bearing has failed. This bearing is what the clutch shift fork rides against, which in turn allows the transmission to shift gears. The other possible scenario is that...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.