1 hour ago, Secondo said:

Hi Dan, good to see you here.

Your GT500 has Ford GT-style dual fuel pumps. If you are running a boost-a-pump, check wiring to them (under the rear seat) and fuses. I`ve seen melted wiring at the pumps when running a boost-a-pump. One of the pumps may not be functioning. 

Correct.  But at least on the GT the monitoring system is very good at detecting a bad pump and throwing a check engine condition.  If you have the boost-a-pump system I would look there first. 

21 hours ago, Secondo said:

Hi Dan, good to see you here.

Your GT500 has Ford GT-style dual fuel pumps. If you are running a boost-a-pump, check wiring to them (under the rear seat) and fuses. I`ve seen melted wiring at the pumps when running a boost-a-pump. One of the pumps may not be functioning. 

Thanks man, I`ll look at that.

19 hours ago, mhr1961 said:

Robert,

You do realize that the Fuel Lab gauge is also made by Marshall? Look at the bottom of the guage, its says Marshall. many large gauge companies private label for smaller companies.

Here is perhaps a better choice. Summit Racing Part#153009. This one appears to be a dry fill fuel pressure gauge, chrome bezel and housing, 1/8 npt center back mount. Black face/white letters and a red indicator.

here is the linky:   https://www.summitracing.com/parts/vdo-153009

I would also call them and ask for the temperature rating, and ask whether the gauge had a clear plastic face, or glass face. For the price point it is at I would think it is probably glass. If plastic I would pass on it because if you get fuel or oil on it then it will likely cloud up. It also has a restrictor (orifice built in to the gauge to dampen pulsation).

I also talked to Marshall (actually emailed back and forth), they said their dry gauge would be fine for under hood heat, he said many are mounted that way and also mentioned, as you pointed out , the liquid filled is not good under the hood. but they (Marshall) did not offer a dry gauge with a Black case, that was the issue.

I also should mention, in the Marshall email, he did not say "all" of their dry gauges work in under hood heat and he did not say which ones do or don`t, I wanted a Black case for the "stealth" look and they did not have a dry gauge in a Black case, so that ended the conversation.

Also, the Fuelab gauges? Does Fuelab have a specific spec. for their Marshall made gauges that may be different for the common offerings from Marshall? IDK? They may be the same, but with a different name on the face.....or they may be built to specific Fuelab specs.? Right from the beginning it is interesting that Fuelab offers a 1.5 Dry gauge in a Black case, and Marshall does not........if all are made by Marshall......Also, the Marshall gauge is 0-100, the Fuelab 0-120........

It looks like it is out for delivery today, I will see how it looks......

R

2 hours ago, Robert M said:

I just sent you a PM with Rick@KB`s email address.

Thanks Robert.  I`ll send him an email.