HMMWV fuel pressure testing and IP timing

Q1:
I suspect a lift pump failure on my 6.2. Looking to tap in a test gauge at the pump and/or filter. What fittings/where do you tap in?

Q2:
IP advance is set at the marks no additional advance. Are there less expensive ways to check timing eg an inductive timing adapter etc?


Sent from my iPhone using Tapatalk

Engine off. Relieve pressure from drain valve (by washer fluid tank) of fuel filter can. Use something to catch any furl. Hold valve open and have someone crank motor. If you get flow out of drain, then lift pump is working. You can remove wire from top of injection pump to prevent motor from starting.
Fuel pressure should be at least 3 psi.
Or remove linput line from injection pump and divert flow to measuring container. You should get 1 pint in 30 seconds of cranking.

Thanks Action


Sent from my iPhone using Tapatalk

YOU CAN ALSO ADD THIS IN FOR FUTURE USE.

jkcondrey said:

Relocating the fuel filter assembly.. My idea..

Looking for opinions on my idea to relocate the fuel filter assembly. Thinking about relocating the fuel filter assembly to the vertical wall section right in front and below the windshield washer tank. Looks like it will have plenty of tire clearance. No problem to extend the fuel lines...

www.steelsoldiers.com

YOU CAN ALSO ADD THIS IN FOR FUTURE USE.

Click to expand...

Nice. I was thinking exactly along these lines of adding a mechanical gauge to the filter either at the pressure transducer location or the drain tap via a tee.


Sent from my iPhone using Tapatalk

Lift pump tested good for cold cranking flow


Sent from my iPhone using Tapatalk

rcamacho said:

Lift pump tested good for cold cranking flow


Sent from my iPhone using Tapatalk

Click to expand...

Now you can remove the input line from the injection pump and test flow there while cranking. If that is slower, you may need a new fuel filter.

Water separator is opened while engine running....if the engine immediately dies, your lift pump is bad.
should fill a pickle jar in short order if working good.
you can remove the useless transducer on top of the fuel filter and add a pressure gauge.
the transducer is only used for the ste/ice garbage, also removing it makes it easier to change filters.

"you can remove the useless transducer on top of the fuel filter and add a pressure gauge."


RWH.... I'll drink to that, CAMO