Symptoms | Test | Results | Diagnosis and reference number for below
|
Engine light comes on | Turn gas off | Light goes out |
Injectors not physically able to close down enough (5) |
Hook hoses together with gas off | Light goes out | Unit is resticting too
much air (1) |
Engine surges at idle consistently | Shut gas off, hook hoses
up together | Surging stops | Unit is restricting too much air (1) |
Surging continues | Check for a vacuum leak |
Engine is hard to start or flooding occurs | Take off 1/8"
copper tubing at unit | Gas spurts out inconsistently | Vapor locking is occuring
(2) |
Gas flow is more than a fast drip | Adjust the valve on the tee down |
On fuel injected models only ! Gas continues after engine is turned off |
Make sure the tee is in the return line (3) |
Run clear hose test with the PCV line connected | Is the gas moving slower than
when PCV line is disconnected | PCV line is restricting too much air (7)
|
Check the position of the unit | Is the vapor out hose higher than the unit |
Raise unit so the hose is going down from unit |
Check vapor adjustment | Is the lever more toward the front of the unit |
Close adjustment, and start over, moving it a 1/16" at a time |
Idles rough on carbureted vehicles | Check for fuel filter
between gas tee and carburetor | No | Clean or replace needle valve in carburetor
|
Yes | See: "Hard to Start" in Row 1 |
Gas mileage not consistent | Take off 1/8" copper tubing at unit | Gas
spurts out inconsistently | Vapor locking is occuring (2) |
No results in gas mileage | Open vapor control lever all the way |
Engine doesn't flood | Open the gas tee more |
Check vapor out hose | Is it less than 4' | Replace with 4' hose |
On fuel injection, increase in horsepower is noticed but not in gas mileage |
Check oxygen sensor | Replace if necessary |
On carbureted, check tail pipe | Is it black or does it throws black smoke when
started | Float in carburetor needs lowered |