help at Wits end
Thread Starter
Teching In
Joined: Dec 2009
Posts: 26
Likes: 0
From: Jax fl
help at Wits end Help I have a 77 el camino with a rebuilt lq9 / 799 heads / and stage 3 cam/ ls6 intake
my problem is the fuel coming to the engine has air foam in the line
she will start briefly than die. have changed the wire harness, changed the computer , changed engine was 5.3 same problem
replaced fuel pump twice injectors 3 times etc
if I squirt starting fluid in intake it will run for a few seconds
put fuel pressure gauge have 57 # pressure when I blead off the fuel from the gauge its white with air
pushing on the shrader valve foamy gas comes out.
the pump is external
changed pump and put a gas line straight into the gas can........same thing starts briefly then dies
don't know where to go or what to do
my problem is the fuel coming to the engine has air foam in the line
she will start briefly than die. have changed the wire harness, changed the computer , changed engine was 5.3 same problem
replaced fuel pump twice injectors 3 times etc
if I squirt starting fluid in intake it will run for a few seconds
put fuel pressure gauge have 57 # pressure when I blead off the fuel from the gauge its white with air
pushing on the shrader valve foamy gas comes out.
the pump is external
changed pump and put a gas line straight into the gas can........same thing starts briefly then dies
don't know where to go or what to do
TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
Its sucking air between the pump and tank. This used to be common in the old mechanical carb days.. often mistaken for vapor lock.
It can also be because your pump is over working and cavitating the fuel. which WILL happen more often on non return systems.
If your pump is > about 200 LPH,, there's a good chance.. When the over pressure relief opens its recirculating inside the pump overheating the fuel and causing it to out-gas violently.
It can also be because your pump is over working and cavitating the fuel. which WILL happen more often on non return systems.
If your pump is > about 200 LPH,, there's a good chance.. When the over pressure relief opens its recirculating inside the pump overheating the fuel and causing it to out-gas violently.
Thread Starter
Teching In
Joined: Dec 2009
Posts: 26
Likes: 0
From: Jax fl
wits end yes the ecm was flashed for standalone use both of them were
have tried putting a hose from the pump straight into a gas can same problem no difference
as for the pump being too big making for cavitating could be the problem
using a walbro gsl 392 pump
the problem is as soon as I start the cold engine it stops running even with the key still on start
have tried putting a hose from the pump straight into a gas can same problem no difference
as for the pump being too big making for cavitating could be the problem
using a walbro gsl 392 pump
the problem is as soon as I start the cold engine it stops running even with the key still on start
TECH Fanatic
Joined: Jan 2009
Posts: 1,063
Likes: 475
From: Bostwick, GA.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
