Fuel Pump Question
Thread Starter
Instructor
Joined: Jan 2008
Posts: 149
Likes: 8
From: Scarborough Qld
Fuel Pump Question
I think my fuel pump might need a little work.
I have been making slight adjustments to my Q-Jet & getting a little better response.
When I am at WOT in 1st, 2nd, and even 3rd, the engine pulls strong & smoothly.
In 4th, the engine doesn’t want to pull smoothly, almost feels like its missing. As the revs get higher its starts to smooth out.
In 5th gear I cant get it to go past 100 mph. Feels like its missing again. & not enough torque to get the revs up.
Could I be draining the bowl because the pump isn’t keeping up?
Thanks in advance.
Andrew
I have been making slight adjustments to my Q-Jet & getting a little better response.
When I am at WOT in 1st, 2nd, and even 3rd, the engine pulls strong & smoothly.
In 4th, the engine doesn’t want to pull smoothly, almost feels like its missing. As the revs get higher its starts to smooth out.
In 5th gear I cant get it to go past 100 mph. Feels like its missing again. & not enough torque to get the revs up.
Could I be draining the bowl because the pump isn’t keeping up?
Thanks in advance.
Andrew
Thread Starter
Instructor
Joined: Jan 2008
Posts: 149
Likes: 8
From: Scarborough Qld
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
Sounds like fuel starvation. Float level too low (top of float should be about 5/16" below the upper edge of the float bowl, when you depress the float pivot pin downward and gently seat the needle by pushing the float end down); kink in rubber hose at fuel pump; damaged/pinched fuel line (rubber or metal); fuel filter clogged (internal carb filter or in-line filter); clogged strainer sock at fuel tank outlet.
Less likely to be ignition, air inlet restriction, or valve train related as the engine revs up fine in lower gear ranges.
Less likely to be ignition, air inlet restriction, or valve train related as the engine revs up fine in lower gear ranges.
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
Sounds like fuel starvation. Float level too low (top of float should be about 5/16" below the upper edge of the float bowl, when you depress the float pivot pin downward and gently seat the needle by pushing the float end down); kink in rubber hose at fuel pump; damaged/pinched fuel line (rubber or metal); fuel filter clogged (internal carb filter or in-line filter); clogged strainer sock at fuel tank outlet.
Less likely to be ignition, air inlet restriction, or valve train related as the engine revs up fine in lower gear ranges.
Less likely to be ignition, air inlet restriction, or valve train related as the engine revs up fine in lower gear ranges.
On a Q-Jet, the internal fuel filter is the first check, as that one often never gets changed as many folks don't even know it's there...
