RCU Forums - GST 7.7 problem high speed

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watapisr

04-06-2008 10:51 AM

GST 7.7 problem high speed

When i start the genesis 7.7 it will idle great runs good at 1/2 to 3/4 throttle but if i run at full throttle for more than 50 yards or so it dies, acts like it runs out of fuel and wont push fuel through the line even when i hold my finger over the exaust, if i let it sit for a few minutes it starts like a champ but still does the same thing over and over, Im new at this and dont have a clue, putting in new glow plug today to try that, any more suggestions?

nomobux

04-06-2008 10:59 AM

RE: GST 7.7 problem high speed

Quote:

ORIGINAL: watapisr

When i start the genesis 7.7 it will idle great runs good at 1/2 to 3/4 throttle but if i run at full throttle for more than 50 yards or so it dies, acts like it runs out of fuel and wont push fuel through the line even when i hold my finger over the exaust, if i let it sit for a few minutes it starts like a champ but still does the same thing over and over, Im new at this and dont have a clue, putting in new glow plug today to try that, any more suggestions?

Couple of things to ck. Sometimes they got some locktite in the exhaust pressure line fitting. Run a wire or something thru it to check. Check the O-ring on the tank cap and make sure you push the cap down tightly. Check that all fuel lines are tite and not against the head , etc. Have you messed with needle settings at all yet ? Is the truck new or what ? Also is this with a full or half tank ?

burningpoo

04-08-2008 12:08 PM

RE: GST 7.7 problem high speed

Do you have a check valve installed yet? What glow plugs are you useing? Kind of sounds like your needles need to be setup

chrobar

04-08-2008 07:25 PM

RE: GST 7.7 problem high speed

Sometimes when you are at about 1/2 tank, you can experience 1/2 tank lean. This means that the fuel to air mixture gets leaner than usual, and could be setting off your settings. Try to richen the mixture a bit and see how it goes. Make sure to try and check your temperature with either a temp gun, or using the spit test. If the temp is over 260 or so, it could be that the mixture is too lean.

watapisr

04-08-2008 08:50 PM

RE: GST 7.7 problem high speed

Thanks to all for the help, I will check all. I did find that i wasnt getting a good seal from the exaust header to the pipe think that might have solved my problem. After i figured that out i lost a dang wheel and threw the pin that holds the wheel on.......I know I know....... anyway ordered parts from cen should get them later in the week ill let you know how it goes.

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