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I forget what post it was but I was asking you to remove the return line that comes off the head and goes up to the T on the secondary. If I remember I told you to remove that line at the T and stick that line in a gallon jug or a jug and turn on the in tank pump. Here I was wanting to see if...

Okay we're definitely talking about the 12-point cap on the side of the hydraulic head not the interference fit hex head that's on the top. Yes that's why I said you got to be careful that little spring. Then there's the delivery valve inside of there. Has a slot in it and a right size flat...

The delivery valve is that 12-point cap on the side of the head facing the firewall. Underneath there is a small spring and the delivery valve. It's kind of like a needle in seat. It can be removed and cleaned and the seat also cleaned.

This is tread is getting pretty long and you still haven't found the problem. Without reading through the whole threat again did you happen to check that delivery valve on the side of the head?

On the secondary fuel canister there is the over pressure valve. On the Head there is the over flow valve and the booster on the IP is the bypass valve. The bypass on the booster opens when there is an over pressure in the booster pump and it just reroute the fuel back to the booster pump inlet...

Well I thought I mentioned it earlier. To check that delivery valve that black 12 point cap on the side of the head. Just don't lose that little spring so take the cap off real careful. I did a post about it on the board showing a picture of that delivery valve that it has a screwdriver slot in...

Although the booster pump can produce as much as 70 80 psi it's that overflow valve on the other side of the head that maintains the pressure the pump can put out. I tried to describe it once like a garden hose without any nozzle on the end you turn it on and there's a big stream coming out but...

Myself I would hold off on removing the hydraulic head as the op says once he gets it started it will run. I sent a PM telling him to remove the cap and not to lose the spring and check the delivery valve. Also he can remove the cap and check the overflow valve is not all gummed up. Same thing...

Have you even checked the fuel control unit assembly? It should work freely and be in the 7:00 position. With your finger you should be able to push it towards the firewall and let it go and it snap back to 7:00.

You can put a 0 to 20 psi gauge on the bleeder screw and try cranking the engine over and see what kind of pressure you're developing.

On a good working system the in tank pump will circulate fuel through the entire system and back to the fuel tank before you hit the starter. The thing is throwing me off is he said he's having some high running pressures almost 80 psi. On a good running system and the whole system primed we...

I do not believe his plunger timing button and clip has fallen off because he said it run fine after getting it started. The IP booster has a bypass built in and if it is open / leaking it puts the fuel from the booster back into the fuel inlet of the booster. Do not know if this could cause a...

Just to be clear I never said not to try and pressurize the suction side of the IP booster pump. Yea OP could drop the rubber line off the IP booster and drop off suction line on top of fuel tank and see if there is a leak. What I have found with a system that has 70 psi pressure of fluid will...

Still waiting to hear OP check the rubber line that is the jumper from copper to IP booster. That's where I am leaning since the OP said in tank rubber was replaced along with fuel line and filter canister checked.

The OP brought up air in the system so I just said to look on the suction side of the booster as in lines /filter or rubber hose that is on the copper cross over fuel that attaches to the booster. Obvious would not be on pressure side or after booster with his system making 70 / 80 psi as it...

Yep while working before I had my slab and carport for the trucks I was careful when working with the fuel control assembly little clip / the little spring in the delivery valve and spring in the over pressure valve. Then again I had more than one Deuce parts trucks if I got unlucky. So glad you...

The line coming off #1 Injector is the injector Return lines from all injectors. It will always look like the is some air /fuel trapped in that line. While the injectors do not return fuel under pressure / flow they burp sometimes. This is not a problem and if you look at any multi fuel they...

One thing for the IP is fuel flowing through the head and back to the tank so we need a good working in tank pump / inline pump to clear air after filter change. The easy way of checking fuel flow through the head and also checking the over pressure valve would be this. The fuel line that comes...

Just spit balling here so lets start with the gages. They are wrong or you have an over pressure in the system. Most LDT's seem to be running around 30 psi idle and 60 psi high idle. Now that is the specs for minimum performance levels. Now the LDS pump has specs that are higher and over 70...