No prime?

jeep
wrangler

#1

it feels like I lose the prime to my fuel pump with the power offfor several hours. bad pump or fuel line fittings


#2

Check valve in fuel line.

Turn ignition to “ON,” wait 5 seconds for pump to prime system, then turn key to “START.”


#3

A bad anti-drain back valve on the fuel pump assembly will cause this problem. If you can get the engine to start by cycling ignition switch on/off several times before starting the engine it points to a problem with the anti-drain back valve. Unfortunately, it requires replacement of the fuel pump assembly to remedy the problem.

Tester


#4

How do you feel loss of fuel prime? What makes you think that? Is there a problem with starting?
When the engine is turned off, the fuel pressure will stay up for several minuets—maybe a half hour.
Normally, after you turn the ignition key to START, the fuel pump will run as long as the engine cranks; and, it will take 6 to 8 seconds to reach normal fuel pressure.
If you want full fuel pressure first, turn the ignition ON for 4 seconds, OFF, ON for 4 seconds, OFF, ON for 4 seconds, and then crank the engine.
The static fuel pressure can bleed off through the fuel pump, OR through the fuel pressure regulator, OR leaking fuel injectors, OR any other leak.


#5

is the check valve at the pump or inline? in the past i didnt ave to wait the 5 seconds, i do that now cause it just cranks for 30 seconds before ignition

thanx


#6

thanx!