My car was off the road for about 3 weeks, while I was putting in a new heater core.

When I went to start it I found the battery flat, so I brought a charger and charged it.

Now if I put my key in and crank it, it wont start, It just makes that turning over sound.

It will only start if I accelerate while cranking, is this my battery, starter motor or something else?

hmm makes sense, because first time I start it, I need to press the pedal, but if I turn it off then start it again, it starts fine.

Its efi, not sure about what type of fuel pump but, how do i find out.

Once i get the car started it runs fine, but every so often when its ideling or running it starts jolting until i give it some gas.

Timing is advanced because i only run LPG and high octane, and I thought this jolting problem was the advanced timing making it ping. But its been set on this timing for nearly a year and havnt had any pinging problems.

I'm still going to set the timing back, but a fuel pump problem sounds more like the culprit to the problem.

How do i check what type of fuel pump it is and are there other things I can do to check if the pump is at fault.

Fuel pump check valve. This is easily tested by starting the engine and watching the fuel pressure rise. Turn off the engine. If the fuel pressure drops quickly, then your check valve is stuffed.

Air in the pipes is flushed back out to the tank, the magnas do not run a returnless system. If he had said hard starting once very hot I would have suggested a vapour lock (which is where the fuel in the rail evaporates - why you INSULATE fuel rails from the heat of the engine bay... Not use little alloy bits to transfer heat - not mentioning any names or products here - besides, you reduce the specific energy of the fuel when hot - why were fuel coolers invented?)

I had a Saab Turbo that did this (vapour lock) all the time - used to $hit me right off... I insulated the fuel rail with some pipe lagging and it fixed it (slightly more power too).

Cheers
Heath Young

"Fuel pump check valve. This is easily tested by starting the engine and watching the fuel pressure rise. Turn off the engine. If the fuel pressure drops quickly, then your check valve is stuffed."

How do you watch the fuel pressure rise and drop?

Works fine on gas, problem is only when its running on petrol.