HAS MIT Researchers found a new energy fuel in the Andes Mountains and now in the US?

Both fuel pump relays probably are plugged into the junction block.

Only from the dealer parts dept.

What does or doesn't it do???
Is it cranking, is there a clicking noise? Is there any lights on the dash? Give us something to work with!

Hi Tom:
No make or model given so don't know type of ignition.
Would it be a big deal for you to do a compression test?
That might give a hint.

It could be fuel pump. It may be something else... Engines need fuel, spark and air to run. Remove any one, it won't start.

A few ideas. 1) Try the motor home where you are now and see. Find some REALLY steep hills or something and try it out.
2) If it is an automatic transmission, you may need to purchase a "transmission cooler" kit to add on before you try mountain climbing.
3) If it is a stick shift, take along another clutch disc and pressure plate and throwout bearing in case you burn yours up.
4) And remember, cars and trucks that normally operate at sea level will not do well in high mountains. They need to have the timing and/or carburetor set for high altitudes.
5) Many countries outside the USA have different octane ratings on their gasoline, you will need to take along the stuff to set your engine to the octane rating of the gas you buy.
Be blessed

engine consume lot of fuel.clogged air filter.low tire pressure.faulty emission control device.dirty fuel injectors.heavy foot on accelerator.lot of short stops like driving in the city.running AC will consume gas.high mileage engine low compression assume lots of fuel.slipping transmission.weak ignition.driving up steep grades or mountains burns more fuel.

I would change your fuel filter. The mountains, and the sudden jerking would provide a great chance for the fuel to pull up any nasties, and then run them through the line.

I wouldnt say wrong spark plugs but maybe the wrong gapping on the spark plugs.. Is the car parked in a garage? it sounds like maybe your fuel pump

Big tires:

1. Hard time for your drive train (clutch, cv joint, tranny, diff gears) , power steering, brakes
2. Slow acceleration
3. possible fender damage
4. turning radius problem
5. increase body roll and instability
Advantages:
1. good ground clearance
2. softer ride
3. Enhanced off-road ability

tires your planning to buy can fit into your existing rims.
My personal opinion is for you to go for the bigger tires!