1985 P30 Chassis-Where is the Fuel Pump Relay?

[TitanicPilot]

The P30 chassis has an in-tank electric pump, a chassis rail mounted booster pump, plus the mechanical pump on the engine. The electric pumps won't run and I can't find the fuel pump relay that is shown in the schematic. Can anybody tell me where to look for that little devil?

Thanks,

[Gary - K7GLD]

HMMmmmm - wonder if that's true on our P30 based '88 Winnie as to the intank pump?

[JimElliott]

Originally Posted by Gary - K7GLD

HMMmmmm - wonder if that's true on our P30 based '88 Winnie as to the intank pump?

Gary, My 87 had the in the tank pump but I'm not sure about the 85 model.....

The current 83 only has the mechanical and I made the big mistake of adding a "Carter" electric pump

Carter claims the fuel can be pulled through but with a stock A.C. Delco mechanical pump and thats not true, Added a Edelbrock 1722 mechanical and tossed the Carter and all is well.

Jim

[mfire1339]

My thinking was if the engine was fuel injected it got an high pressure electric pump in fuel tank. My 85 was carb'd so just a mechanical pump.

Mike

[EngineerMike]

Dave- my 95 P30 V-8 diesel had an oil sender/ fuel pump relay in the valley of the V (as in V-8) at the rear of the engine. Hard to see and had to R&R it by Braille. Took a special deep socket, tho it was available at any NAPA. Oil pressure pushed a plunger w/contacts on it to close the relay & allow continued fuel pump voltage; the ECM discontinued fuel pump voltage after about 5 seconds so the electric pump needed the relay closed to keep fuel pumping & engine running.
Your gasser may have a similar relay in the same area (GM's engineers designed both engines).

[justimagination]

Dave,
I may not have an answer for you, but on my previous 1982 Pace Arrow P-30 454 engine, which had a carbeurator, I could not be sure if it even had a fuel pump in the Fuel tank. It only had the Electric Pump mounted on the frame rail, prior to going to distribution block. That motorhome had two (2) seperate fuel tanks, with a switch on the left side of the dash panel. The switch for the electric pump was located right below the fuel tank switch. The motorhome would run fine on the engine mechanical pump without the help of the electric pump as long as you were on the front tank. If you switched to the rear tank, which held more gals of fuel, you had to turn on the electric pump or it would start to miss for lack of fuel flow. Keep up the good work, and good luck.
David G.

[roadwalt]

On My 87 Winnebago Chieftan 31', I had two tanks, main 60gal, and Aux 35gal. The main tank had an in tank electric full pump, the rear Aux tank used only the engine pump. The relay and valving to switch tanks was above the main tank. If the fuel filter located in the side rail was dirty, the engine would only rim on the main tank, and stumble badly on the Aux tank (even with a new engine pump)
Also check the condition of the vent lines above the tanks. Mine cracked bad, and would dump fuel on a fill up.
Good luck

[Gary - K7GLD]

Originally Posted by mfire1339

My thinking was if the engine was fuel injected it got an high pressure electric pump in fuel tank. My 85 was carb'd so just a mechanical pump.

Mike

AND:

Dave- my 95 P30 V-8 diesel had an oil sender/ fuel pump relay in the valley of the V (as in V-8) at the rear of the engine. Hard to see and had to R&R it by Braille. Took a special deep socket, tho it was available at any NAPA. Oil pressure pushed a plunger w/contacts on it to close the relay & allow continued fuel pump voltage; the ECM discontinued fuel pump voltage after about 5 seconds so the electric pump needed the relay closed to keep fuel pumping & engine running.
Your gasser may have a similar relay in the same area (GM's engineers designed both engines).

HMMmmm - seems we're sorta all over the map here - the OP was referring to an '85 P30 GASSER chassis - and likely a GM BB engine, as in my similar '88 Winnie - as far as *I* know, all these setups prior to about '93 were carbureted (not injected!) engines - mine has the block-mounted mechanical pump, and I *thought* I had seen what appeared to be an OEM electric helper pump mounted to the frame rail as well - this subject of an additional electric fuel pump INSIDE the (SINGLE!) 80 gallon fuel tank is a new one for me - and likely does NOT share any particular relevance with MH setups that are diesel, or made after about '93 or so...

I'd sure like to hear more about this - but sorta limited to the general year and fuel system types that actually apply to this topic...

[whem2fish]

my 1985 southwind doesnt have pump in tank my thought would be check the pressure sensor for the oil pressure with no oil pressure electric pump does not get 12 volts
dave

[Gary - K7GLD]

Originally Posted by whem2fish

my 1985 southwind doesnt have pump in tank my thought would be check the pressure sensor for the oil pressure with no oil pressure electric pump does not get 12 volts
dave

We bought our '88 Winnie late this last summer - and I spent most of my time on higher priority repairs and replacements - so other than a few glances in other underside areas, did not specifically look at the fuel tank and lines running to it - including any wiring to the tank. As stated in my previous post, I saw what I *thought* looked like an electric fuel pump on the frame rail in what I *thought* was the fuel line, in addition to the engine mechanical pump I also saw - but didn't take the time to get into a detailed inspection...

[TitanicPilot]

Originally Posted by whem2fish

my 1985 southwind doesnt have pump in tank my thought would be check the pressure sensor for the oil pressure with no oil pressure electric pump does not get 12 volts
dave

Then how do you get fuel to the engine before you try to start it? Is there an overide switch? We have a carburetor, a single fuel tank and no dash switch.

Dave

[whem2fish]

if my rv has sat for a while the carb is dry so motor will turn over maybe 15 seconds before starting this is on the mechanical pump unless some one has abdded a override switch there will not be one i had read the oil pressure switch is a safty in case of a wreck and gas is leaking no oil pressure no gas hope this helps
dave

[TitanicPilot]

I've exchanged emails with Donna R. Roe, Sr. Administrative Specialist at Fleetwood customer relations and she wrote this:

By taking off the engine cover between the driver and passenger seats, the fuel pump relay is a little black relay and would be located on the left hand side of the engine block. The oil pressure switch could also be bad and that would also be on the left hand side, at the bottom by the sending unit. There were some Chevrolet chassis that had an OEM electric fuel pump in the gas tank along with the side mounted electric fuel pump installed by Fleetwood.

When we pulled the engine I didn't see any relay on it, so that still remains a mystery. I will check out the pressure switch as had also been mentioned by whem2fish. I wonder how much pressure it takes to trigger the switch? By the way, we also have the single, 80 gallon fuel tank like Gary - K7GLD.

Thanks for all the suggestions and comments so far; I feel like we're getting close to a solution.

[whem2fish]

hope it works out keep us informed ill try to help
dave